My C60 sunshine has been on my wrist constantly for the past 30 hours and has not even lost or gained a second. Unbelievable. Previous to that when it was worn for about 8 hours then off wrist for 16 hours it gained 7 seconds.

Sounds good, I guess for the 16 hours off of the wrist it just depends on how it was stored i.e . face up/down/crown up/down. I would suggest when its at rest try a different combination until you find the best method.
Kind Rgds
Steve