Massive undertaking today,
I set all my quartz watches' date and timed each one.
Being the recorder keeper that I am, some interesting stuff:
My G9000 went through the year at +6 seconds. I did not wear it a single time, and it sped up during the winter.
Precisionist that claims <10SPY. Well, almost double that. +17seconds. Again I didn't wear it much and it mostly sped up during winter as well. It was +7seconds at November.
1 of my G-Shock went ridiculously fast. Since I set it in end of Nov. +87seconds!
1 of my Solar stopped for 1 day. Oops
I guess I didn't notice the double ticking when I picked it up 2 days ago.
My kinetic only stays at 1-3month charge in the winter ;( Hard to get it in the 4-6month range.
All but 2 of my quartz ran in the positive SPD since Nov.
Average time differential is 18seconds. ~6seconds per month.