What is the “power reserve” on a Rolex watch ?

Mechanical watches are powered by kinetic energy stored in the movement’s main spring which, as it becomes released and unwound.
The amount of time that the piece takes to release this energy to the rest of the movement that would be classified as the watch it’s power reserve. The power reserve of a mechanical watch these days is around 40 hours or so, give or take. It depends on the year, movement and condition.

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