If you let your Rolex sit after wearing it....will the time slow or speed up?

[Kawirider]

Hi. My 1987 Rolex Datejust was just recently serviced by an independent watchmaker. The main spring was supposedly replaced as well. The watchmaker at the time said it’s going to keep perfect time. Well fast forward a few months to now, and it looks to be gaining like 30 seconds after I set it down for the night. I set it Saturday morning to near perfect to the iPhone clock. I wore it for half the day, and every time I looked at it the seconds were still dead on. So I set it down for the night. (No winder) and I just grabbed it now and it seems the seconds are off by roughly 30 seconds. Im an electrician so I don’t get to wear my watch much. Only weekends if I’m lucky. Am I screwing up my watch by wearing it and than letting it die for the week with no winder? It’s just weird how it stays dead on until I let it sit.


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