WATCH RITUAL
Guides / Movements
Movements · 2 min read

Power reserve explained: how long your watch runs off the wrist.

Power reserve is how long a fully wound mechanical watch keeps running without being worn or wound. Most affordable automatics run for about 40 hours; newer movements reach 70 to 80 hours, which means a watch taken off on Friday evening is still running on Monday morning.

By Sebastian Bassolino, Editor · Updated October 17, 2026

Typical reserves for common movements.

MovementFound inRated reserve
Seiko NH35 / NH36 / 4R35Seiko 5, Presage, many microbrandsAbout 41 hours
Citizen 8200 familyCitizen automaticsAbout 42 hours
Miyota 8215Many affordable automaticsAbout 42 hours
Sellita SW200Swiss microbrand and mid-range watchesAbout 38 hours (longer on newer versions)
Tissot Powermatic 80Tissot PRX, Gentleman, Le Locle80 hours

Ratings are manufacturer figures and can vary by version; check the specification for your exact watch.

Why reserve matters.

If you wear one watch every day, a 40-hour reserve is plenty. If you rotate between watches or take yours off at weekends, a longer reserve means less resetting. It also matters for complicated watches with a date, day or moon phase, because those take longer to set after a stop.

Wearing it may not fully wind it.

An automatic winds as you move, but a desk day may not add much. If a watch stops sooner than its rated reserve, give it 20 to 30 turns of the crown in the morning (if it can be hand-wound) and see whether it lasts longer. Check your manual: some movements specify a number of turns from empty.

Do you need a watch winder?

No. A winder keeps an automatic running when you are not wearing it, which saves resetting a complicated watch. It does not make the watch healthier, and constant running adds wear. If you only own one or two simple automatics, setting them when you put them on takes less than a minute. How to set an automatic watch.

Long-reserve automatics.

A few good questions.

What is a good power reserve for an automatic watch?

About 40 hours is normal. Anything from 70 to 80 hours lets the watch survive a weekend off the wrist.

Does a longer power reserve mean better accuracy?

Not directly. Some movements keep more even time when the mainspring is well wound, but accuracy depends on the whole movement and its regulation.

Is it bad to let an automatic watch run down?

No. Modern automatics can stop and restart without harm.

How we write guides: we explain watchmaking from manufacturer documentation and published standards, and say plainly where numbers vary by brand or movement. Our approach.