Some 3861 technical questions

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I recently purchased a new 3861 sapphire sandwich moon watch. I love it!

But I have few questions related to power reserve and chronograph.

1. Is there a rule of thumb or estimate for the degree of power reserve loss caused while running the chronograph (ie. 2x or 3x normal runoff)?

2. If I start and then stop the chronograph but don’t fully reset it (don’t zero it out), does the chronograph still continue to draw the additional power reserve life even though it is not technically running?

3. Continuing on from my 2nd question, is there any technical reason why you shouldn’t leave the watch in this state for potentially long periods of time (chronograph is stoped but not reset)? Can it compromise any parts or accuracy longterm?
 
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Thanks! That helps.
There are plenty of other threads regarding stopping chrono but not resetting for long periods if you search through threads but in short - it's not really a problem