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The Power Reserve

Power reserve is the number of hours/days that a fully excited spring can give energy before the watch has to be rewound.

The Power Reserve

Power reserve is also called 'Réserve de Marche'. Generally, a fully wound up spring has about 36-42 hours before it stops, but there are also timepieces that have a power reserve up to three or more days. The power reserve indicator is a complication of the watch that indicates how many hours or days the watch still has energy before it has to be wound up again.

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