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isn't the concept of power reserve that u can lay the watch down and it will keep running for up to 48 hours? I took mine off yesterday at 1pm. It stopped 9 hours later. Does winding it more increase the power reserve?

I usually wind my 5120 between 15-20 times. I'm not getting anywhere near 48 hours of power reserve. Am i winding enough? Can this watch be overwound?