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Automatic Watch Power Reserve Explained

By the Watch Winder Guide editorial team · Updated · 7 min read

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An automatic watch's power reserve is how long it keeps running, from a full wind, once you stop moving it. For most modern automatics that is about 40 to 80 hours. The Seiko 4R36 in a Seiko 5 Sports is rated at about 41 hours. The Rolex calibre 3230 in a Submariner is about 70 hours. The Tissot Powermatic 80 and Hamilton H-10 reach 80 hours.

So how long can an automatic watch run without winding? Off the wrist, from full, roughly two to three and a half days, depending on the movement. Below are the published figures, what decides them, and how to get the most from yours.

Power reserve by movement

Every figure in this table comes from the watchmaker's own product or caliber page.

Movement Example watch Power reserve Winding
Orient F6724 Orient Bambino 38mm About 40 hours Automatic, hand-winding
Orient F6922 Orient Kamasu About 40 hours Automatic, hand-winding
Seiko 4R36 Seiko 5 Sports SRPD55 About 41 hours Automatic, hand-winding
Seiko 4R35 Seiko Presage Cocktail Time SRPB41 About 41 hours Automatic, hand-winding
Omega 3861 Speedmaster Moonwatch Professional 50 hours Manual only
Omega 8800 Seamaster Diver 300M 55 hours Automatic, bidirectional
Omega 8900 Seamaster Aqua Terra 60 hours Automatic, bidirectional
Rolex 3230 Submariner About 70 hours Automatic
Tissot Powermatic 80 Tissot PRX Powermatic 80 80 hours Automatic
Hamilton H-10 Khaki Field Auto 80 hours Automatic
Hamilton H-50 Khaki Field Mechanical Up to 80 hours Manual only

A useful rule of thumb: under 48 hours means a watch taken off Friday night will usually be stopped by Sunday. 70 to 80 hours usually gets you to Monday.

Taken off on Friday night Hours a full watch runs, maker's figure Orient F6724about 40 hSeiko 4R36about 41 hOmega 880055 hOmega 890060 hRolex 3230about 70 hPowermatic 8080 h SatSunMonTue 48 h72 h Hamilton H-10 also runs 80 h.
Under 48 hours, a Friday-night watch is usually stopped by Sunday; 70 to 80 hours gets you to Monday.

What a power reserve actually measures

The mainspring is a long coiled spring inside a drum called the barrel. Winding tightens it. As it unwinds, it drives the gear train and, through the escapement, keeps the balance wheel swinging. The power reserve is simply how long that unwinding lasts, from fully wound to stopped, with the watch at rest.

Two caveats matter:

  1. It assumes a full wind. If you wore the watch for three hours at a desk, it may hold only a fraction of its rating.
  2. The last hours are the least accurate. SJX Watches explains that a mainspring delivers high torque when fully wound, settles into a steadier middle range for most of its run, then drops off as it nears empty. Seiko puts it plainly for owners: an under-wound watch may gain or lose time. Other causes of drift are covered in our guide to an automatic watch running fast.
Mainspring torque over the run high when full steadier middle range most of the run drops near empty full wind stopped time off the wrist An under-wound watch may gain or lose time.
The last hours of the reserve are the least accurate, so keep a watch in its middle range.

What decides the number

Mainspring length and barrel size

A longer, thinner spring in a bigger barrel stores more turns. SJX Watches notes the trade-off: a single large barrel built for a long reserve can hurt timekeeping, because torque varies more over its run.

Two barrels

Some movements split the energy between two barrels, which can extend the reserve or smooth the torque.

Escapement efficiency and beat rate

A more efficient escapement wastes less energy per beat. Rolex credits its barrel architecture and the efficiency of its escapement for the 3230's roughly 70-hour reserve. Beat rate matters too: a balance beating faster uses energy faster, so lower-beat movements can stretch a reserve.

Materials

Modern alloys and silicon parts can reduce friction and allow longer, thinner springs. Tissot's Powermatic 80, for example, pairs its 80-hour reserve with a Nivachron balance spring.

How to get the most from your power reserve

  1. Start with a full wind. If the watch has stopped, wind it through the crown. Rolex calls for at least 25 turns for adequate partial winding. Grand Seiko says about 60 turns sufficiently winds its 9S61.
  2. Wear it long enough. Seiko recommends more than 10 hours a day for its 4R watches, or a full wind every day at a fixed time if you are not wearing it.
  3. Top up on quiet days. A desk day may not move the rotor much. Twenty or thirty crown turns in the morning help.
  4. Store it dial-up or crown-up consistently. Position changes the rate slightly, so a consistent resting position makes the overnight drift more predictable.
  5. Use a winder for watches you rotate. It replaces the energy the watch uses each day. Match the turns per day and direction in our watch winder settings lookup.

Full step-by-step instructions are in how to wind an automatic watch.

How to measure your watch's real power reserve

The maker's figure is a lab number for a fully wound watch at rest. Your own number may differ, especially on an older or unserviced watch. You can check it at home in about three days.

  1. Wind the watch fully by hand. Use the maker's guide: about 60 turns for Grand Seiko's 9S61, and about 80 turns for most automatics according to Tissot's manuals.
  2. Set the time precisely and note the date and time.
  3. Put it down and leave it still, dial-up, away from magnets and heat. Do not wear it or move it.
  4. Check it every few hours toward the end of the expected reserve.
  5. Note when the seconds hand stops. The time between full wind and stop is your real power reserve.

If the result is far below the maker's figure, the spring may not be reaching full wind, or the movement may need servicing. A result close to the rating means the watch is healthy, and any stopping in daily use comes from under-winding.

Daily wear vs power reserve

A rated power reserve tells you how long a full watch runs. It does not tell you how full your watch is. That depends on wear time and activity. Seiko's advice for its 4R movements, more than 10 hours a day on the wrist, is a good benchmark for most automatics.

A few patterns to expect:

  • Active day, all-day wear: the watch ends the day near full and easily survives a night on the nightstand.
  • Desk day, all-day wear: less rotor motion, so less winding. Most watches still survive the night, but short-reserve watches can run low after several quiet days in a row.
  • Rotating several watches: each one gets only occasional wear, so it rarely reaches full wind. This is where a winder or a morning crown wind helps most.

Power reserve and watch winders

A winder does not need to know your power reserve, but it helps to think in those terms. A watch with a 40-hour reserve has less margin than one with 80 hours, so a winder that rests too long between cycles could let a short-reserve watch slip into its weak final hours.

Some winders build this in. WOLF's programmable winders, including the Axis Single and the Module 4.1, let you set a power-reserve window from 6 to 72 hours in 6-hour steps, so the winder pauses and lets the watch release stored energy before winding resumes. Orbita says most automatics need 500 to 800 turns per day, with some long-reserve watches needing around 1,300.

Settings lookup

Find your watch winder settings

Base movements (ETA, Sellita, Valjoux, Lemania)

Many brands share these movements. Start here if you know your caliber.

  • ETA 2824-2 (Hamilton Khaki, Tissot, older Tudor, Sinn)Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • ETA 2892-A2 (Bell & Ross, Baume & Mercier, Raymond Weil)Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • ETA 2836-2 / 2834-2 (Tissot, Hamilton day-date models)Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Sellita SW200 base (Raymond Weil Freelancer)Both directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • ETA / Valjoux 7750, 7753, 7754 (most Swiss automatic chronographs)Clockwise only800 TPDOrbita watch database
  • Lemania 5100 (Sinn and Bell & Ross chronographs)Counter-clockwise only800 TPDOrbita watch database
  • Tissot Powermatic 80 (Tissot Luxury Automatic)Counter-clockwise only800 TPDOrbita watch database
  • Tissot C01.211 (PRC 200 and T-Race chronographs)Counter-clockwise only800 TPDOrbita watch database

Rolex

We found no TPD figure published by Rolex itself.

  • Most Rolex automaticsBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • SubmarinerBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Daytona (Cosmograph 4130)Both directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • GMT-Master (16700, Cal. 3135)Both directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Yacht-Master II (Cal. 4160)Not publishedNot publishedOrbita watch database · Orbita lists it as TBD
  • Day-Date / PresidentBoth directionsAbout 600 TPDOrbita Q&AIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • GMT-Master II, Datejust, Day-Date, Yacht-MasterBi-directionalAround 650 TPDBarrington TPD guide (starting point, not a maker spec)If your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.

Omega

We found no TPD figure published by Omega itself.

  • 1108, 1120, 1128, 1140 and related calibersBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 2500 / 2507 Co-AxialBoth directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 8500, 8501, 8520, 8601, 8611 Co-AxialBoth directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 1151, 1152, 1164 (7750-based chronographs)Clockwise only800 TPDOrbita watch database
  • 3301, 3303, 3313 Co-Axial chronographsClockwise only650–800 TPDOrbita watch database
  • 3220Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 9300 / 9301 Co-Axial chronographBoth directionsNot publishedOrbita watch database · Orbita lists TBD
  • 8800 Master Co-Axial (Seamaster Diver 300M)Bi-directionalAbout 650 TPDBarrington TPD guide (starting point, not a maker spec) · Not listed by OrbitaIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 8900 Master Co-Axial (Seamaster Aqua Terra)Bi-directionalAbout 650 TPDBarrington TPD guide (starting point, not a maker spec) · Not listed by OrbitaIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • De Ville, ConstellationBi-directionalAround 650 TPDBarrington TPD guide (starting point, not a maker spec)If your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Planet OceanBi-directional650–800 TPDBarrington TPD guide (starting point, not a maker spec)If your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Automatic Speedmaster chronographsOften clockwise750–800 TPDBarrington TPD guide (starting point, not a maker spec)
  • 3861 Speedmaster Moonwatch Professionaln/aDo not use a winderOmega (winding type) · Manual-wind movement: a winder does nothing for it

Tudor

  • Tudor 2824 / 2824-2 / 2671 / 2834 / 2892-basedBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Tudor 7750 / 7753 / 7754 / 7734 (chronographs)Clockwise only800 TPDOrbita watch database
  • In-house MT56xx calibers (Black Bay, Pelagos)Bi-directionalAbout 650 TPDBarrington TPD guide (starting point, not a maker spec) · Not listed by OrbitaIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Black Bay ChronoBi-directional700–800 TPDBarrington TPD guide (starting point, not a maker spec) · Not listed by OrbitaIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.

Seiko

Seiko USA technical service, as cited by Orbita, estimates 500 to 700 TPD for Seiko mechanical automatics and does not recommend winders for Kinetic movements. Grand Seiko is not listed.

  • 7S series (7S26, 7S36: SKX, Seiko 5)Both directions500–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 6R20Both directions500–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 4S seriesBoth directions650–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 8L series (8L35: Marinemaster, Landmaster)Both directions500–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 9S seriesBoth directions650–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 6S series (Credor, Flightmaster)Clockwise only650–900 TPDOrbita watch database
  • Spring Drive (5R, 6R Spring Drive, 8R)Listed, no TPDNot publishedOrbita watch database · Listed without a TPD
  • 4R35 / 4R36, NH35 / NH36Not publishedNot publishedOrbita watch database · Not listed
  • Seiko mechanical automatics (general estimate)Direction not stated500–700 TPDSeiko USA technical service, cited by Orbita
  • Kinetic movementsn/aWinder not recommendedSeiko USA technical service, cited by Orbita
  • Grand SeikoNot publishedNot publishedOrbita watch database · Not listed

TAG Heuer

Orbita notes that TAG Heuer describes the 1887 as winding bi-directionally at a medium-high setting.

  • Calibre 5, 6, 7, 8Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Calibre 11, 17, 36Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Calibre 12Both directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Calibre 16 (7750-based)Clockwise only800 TPDOrbita watch database
  • Calibre 3Clockwise only650–800 TPDOrbita watch database
  • Calibre 1887Both directions650–1,100 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Heuer 02Not publishedNot publishedOrbita watch database · Not listed

Breitling

Orbita lists over 100 Breitling calibers. This is a representative selection.

  • B01, B04, B05, B06Both directions800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • B13Clockwise only800 TPDOrbita watch database
  • B17, B19Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • B20, B21, B23, B24Clockwise only800 TPDOrbita watch database
  • B25, B26, B27Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.

IWC

  • 30110, 35110, 37524Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 80110, 80111Both directions800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 89360, 89361 (in-house chronographs)Both directions800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 79320, 79350, 7922 (7750-based chronographs)Clockwise only800 TPDOrbita watch database
  • 5000, 51011, 51111 (Big Pilot, Portugieser Automatic)Both directions1,000 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.

Panerai

Orbita says it has contacted Panerai about settings for the P-series automatics and lists several as TBD.

  • OP IV, OP VI, OP VIIBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • OP III, OP V, OP VIII, OP XII and most later OP calibersClockwise only800 TPDOrbita watch database
  • P.9000, P.9001, P.9002Both directions800–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • P.2003, P.9100Both directionsNot publishedOrbita watch database · Orbita lists TBD

Cartier

  • 049 MC (Santos 100 Large, Ballon Bleu 42 mm)Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 076 MC (Ballon Bleu 36 mm, Santos 100 Medium)Clockwise only650–800 TPDOrbita watch database
  • 120 MC, 220 MC (Tank Française, Santos Galbée)Clockwise only800 TPDOrbita watch database
  • 8000 MCBoth directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 1904-PS MCBoth directionsTBD or 650–950 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 191 MCCounter-clockwise only500 TPDOrbita watch database

Patek Philippe

Orbita's Q&A notes that many Patek Philippe watches wind counter-clockwise only.

  • 240 (incl. PS, Q, HU variants)Counter-clockwise only800 TPDOrbita watch database
  • 315, 324, 330Counter-clockwise only800 TPDOrbita watch database
  • 26-330 (5711/1A, 5212A)Counter-clockwise only800 TPDOrbita watch database
  • CH 28-520 (5980, 5968)Counter-clockwise only800 TPDOrbita watch database
  • 335, R27Clockwise only800 TPDOrbita watch database

Audemars Piguet

  • 3120 (Royal Oak 15300, 15400)Both directions600 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 2121 (Royal Oak Jumbo)Both directions800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 4101Both directions600 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • 2325, 2326 familiesCounter-clockwise only800 TPDOrbita watch database
  • 2385 (Royal Oak Chronograph)Clockwise only800 TPDOrbita watch database

Tissot

  • Tissot 2824-2, 2836-2Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Tissot Powermatic 80, C01.211Counter-clockwise only800 TPDOrbita watch database

Hamilton

  • Hamilton 2824-2, 2892-2, 2895Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Hamilton H-21, H-31, 7750 / 7753Clockwise only800 TPDOrbita watch database
  • Hamilton H-10Not publishedNot publishedOrbita watch database · Not listed

Longines

  • Longines Calibers 561 to 651Both directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Longines Calibers 652 to 705Clockwise only800 TPDOrbita watch database
  • Longines Calibers 990, 992, 994Counter-clockwise only800 TPDOrbita watch database

Oris

  • Oris 733 and most 5xx / 6xx calibersBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Oris 735Both directions650–800 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.
  • Oris 672 to 680 chronographsClockwise only800 TPDOrbita watch database
  • Oris Calibre 400Not publishedNot publishedOrbita watch database · Not in Orbita's list; Oris publishes its own guidance in its help center

Zenith

  • Zenith El Primero and Elite familiesBoth directions650 TPDOrbita watch databaseIf your winder doubles bi-directional turns (WOLF says its winders do), enter about half this figure, or confirm the counting in your manual.

Blancpain, Breguet, Girard-Perregaux, Glashütte Original

Published figures well outside the 650 norm. A fully programmable winder is worth it for these.

  • Blancpain Calibre 1315Clockwise only960 TPDOrbita watch database
  • Blancpain Calibre 13R5Clockwise only1,080 TPDOrbita watch database
  • Breguet (several calibers)Direction not stated500 TPDOrbita watch database
  • Girard-Perregaux GP 03300 familyCounter-clockwise only500 TPDOrbita watch database
  • Glashütte Original Calibre 39Counter-clockwise only850 TPDOrbita watch database

Watch not listed anywhere?

WOLF's FAQ suggests 650 to 900 TPD bi-directional as a safe starting range. Barrington suggests starting at 650 bi-directional, checking the watch after 48 hours and raising the TPD by 100 at a time if it stops.

Sources: Orbita watch database and Orbita Q&A; Barrington TPD guide (brand figures are starting points, not manufacturer specs); WOLF FAQ; Seiko USA technical service as cited by Orbita. "Not published" means the source gives no value. Winder makers count bi-directional differently: WOLF says it doubles the TPD, Barrington says it splits the set number between directions.

Power reserve indicators

Some automatics show the remaining reserve on the dial with a small gauge, usually marked in hours. It is handy on a long-reserve watch you rotate, and on manual-wind watches, where it tells you when to wind. Most entry-level automatics, including the Seiko 4R and Orient F6724 watches above, do not have one.

Common mistakes

  • Treating the rated reserve as a guarantee. It is a full-wind figure measured at rest.
  • Letting the watch run to empty every time. Accuracy usually worsens near the end.
  • Comparing reserves across makers without checking the source. Use the maker's caliber page; retailer listings sometimes round differently (we saw 40 and 41 hours quoted for the same Seiko 4R35).
  • Expecting a winder to revive a stopped watch quickly. Give it some crown turns first. If it stops again while fully wound, see automatic watch stopped working.
  • Buying for power reserve alone. Reliability, serviceability and fit matter more for most people.

FAQ

How long can an automatic watch run without winding?

As long as its power reserve, once fully wound. Published figures for popular movements run from about 40 hours (Orient F6724) and 41 hours (Seiko 4R35 and 4R36) to 55 to 60 hours (Omega 8800 and 8900), about 70 hours (Rolex 3230) and 80 hours (Tissot Powermatic 80, Hamilton H-10).

Why does my watch stop before its rated power reserve?

Usually because it was never fully wound. The rated figure assumes a full mainspring. A watch worn for a few quiet hours may store much less. Wind it through the crown, wear it longer, or use a winder.

Is a longer power reserve better?

It is more convenient, because the watch survives a weekend off the wrist. Makers achieve it with longer mainsprings, more efficient escapements or two barrels. A longer reserve is not automatically more accurate, since torque still fades as the spring runs down.

Does a winder need to match my power reserve?

Indirectly. Turns per day should be enough to replace what the watch uses. WOLF's programmable winders also let you set a 6 to 72-hour power-reserve window, so the winder pauses and lets the watch run down slightly before winding again.

Next steps

Want a watch that survives a long weekend? Our affordable automatic watches guide includes two 80-hour picks from Tissot and Hamilton. Rotating several shorter-reserve watches? Keep them on a winder with a rest setting:

Keep reading