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I think it's a balancing act. I think they adjust the movement so that it accounts for a person wearing the watch a certain number of hours per day. If worn more or less or with frequent jolts, the timing can be off. I also manually wind mine depending on how much/little wrist time they get. I generally wear my sub-c 15 hours a day and lay it flat in a watch case for the remaining 9 and it works great for me with my current piece.
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