I set my watch (Oris TT1) to the exact time to a Casio G-Shock to monitor it's accuracy. After a day it was about 2 seconds slower. 12 hours after that it was 1 second too fast, and after another 12 hours it was 1 second behind the G-shock. Is that normal? I do wear my watch all the time, to bed, in the shower, etc.
Could it be the G-shock that's inaccurate?