I have a quartz watch that I set in 2018 and just reset today, after 2 years of drift.
|date||drift||days since set|
|2019-01-04||+10 seconds||33 (+0.3sec/day)|
|2019-02-02||+17 seconds||62 (+0.3sec/day)|
|2019-10-15||+111 seconds||307 (+0.4sec/day)|
|2020-10-18||+256 seconds||686 (+0.4sec/day)|
So it runs less than half a second fast per day. That seems pretty good.
Running 0.4 seconds per day fast means
- in a week, it’ll be 3 seconds fast
- in a month, it’ll be 12 seconds fast
- every year, it’ll run over 2 minutes fast
Not super bad, but if you set your watch on 1 January, you shouldn’t expect to hit New Year’s anywhere but between 11:55p and 12:05a the following year.
I generally want things to be within 30 seconds, 15 really.
That means with a watch like this, I should reset it every month or two. Just something to think about.