Quartz clocks usually use a 32.768KHz cylindrical quartz crystal which has a typical 20ppm error tolerance, this can produce a daily error by seconds as calculated below:
24*60*60*20/1e-6 = 1.728 seconds, monthly: 1.728*30 = 51.8 seconds, nearly a minute.
However RX8025, the Epson Real Time Clock chip, typical accuracy is at 5ppm, calculated as:
24*60*60*5/1e-6 = 0.432 second/day, that's only 12.96 second/month.
I bought the chip from Aliexpress, only 50 cents each, at my test, it can reach as high accuracy as half the specs, which is about 6 seconds per month!
I can't stop updating all my other clocks in my home.