View the original community article here
Last tested: Feb 28, 2018
Max allowed drift is 20 seconds! If it is more then that, you would need to update your NTP.
Note that our install docs specifically state you need to use ntpd, chronyd or similar to keep their time in sync.
https://docs.looker.com/setup-and-management/on-prem-install/installation#enable_ntpd_or_chronyd
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