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I'd say within the power reserve unless you want to reset it every time. I think it's 50 hours spec, but I had longer in my testing. I think it was 60-65 hours if I recall. This for the 3861 movement. And by the way, it kept quite accurate time near the end of the reserve, I am not sure the last 10 hours or so because I was asleep, but at 48-50 it was keeping accurate time.
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