In the default configuration, which is also best practice, time sync settings follow the domain hierarchy for all servers except the PDC Emulator. The domain controller with the PDCe role should sync with an external, reliable time source. This could be an internet time server, a hardware time-keeping device, or an internal NTP server that isn't part of the domain. From there, the other domain controllers in the domain will sync their time from the PDCe. Finally, workstations and member servers will sync their own time from an available DC. This may be the PDCe or it may be another DC in the domain. If this all functions correctly, time across the domain will be in sync with a margin of error of less than a few seconds. The PDCe is the master time keeper, and all other devices in the domain should match the PDCe. If you have questions or need any assistance troubleshooting, just visit: Netgear Orbi Setup - www.therouterhelp.com/netgear-orbi-router-setup/