Accurate timekeeping is hard. Computers generally don't need long-term clock stability, so nobody is going to invest a lot of money into it. Why bother putting

Accurate timekeeping is hard. Computers generally don't need long-term clock stability, so nobody is going to invest a lot of money into it. Why bother putting expensive timekeeping hardware in a machine to avoid clock drift when you can also just sync from ntp once a day? If anything, I'd consider "milliseconds per day" to be extremely good. Regular crystal oscillators have an error of 20 PPM or so, which means a worst-case drift of ~2 seconds per day.