Manual wind Tudor Big Rose

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Hello

I have a question about this Tudor I own. Normally, when I wind a watch, as soon as I feel the counter clockwise resistance of the crown, I stop winding it. When I do that, the watch runs for 12 hours only. However, when I continually wind despite the watch's resistance, it runs for 20 hours+

Is this normal? Won't it break if I continuously wind despite the resistance?
 
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Sounds to me like it’s time for a new mainspring..
 
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You should be able to wind a watch to a hard stop without breaking anything.