> NTP only drifts the clock (under normal operation). That shouldn't be an assumption. NTP may jump the clock if the difference is too high, I've had it once t

> NTP only drifts the clock (under normal operation). That shouldn't be an assumption. NTP may jump the clock if the difference is too high, I've had it once that a system was connected to two different NTP servers and they each had a different clock and the system would jump the clock every now and then based on what NTP server it though was more correct.