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What is the threshold in Windows 2008 when the local clock differs from an NTP source and it will not synchronize?

For example, if the local time is off > 2 days, will NTP still sync? Is there a value that can be tweaked?

No Domain/Active Directory involved here.

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By default, the maximum correction in Windows Server 2008 is 48 hours. You can tweak this value by altering the MaxPosPhaseCorrection and MaxNegPhaseCorrection REG_DWORD values in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters. These values set the maximum number of seconds of time offset that can be corrected for. Microsoft has more detail in their article, including information about older operating systems, but this is the gist of it.

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On your registry.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\NtpServer It usually points to time.windows.com

You can configure an authoritative time server following this KB For the rest of the values involved follow this KB

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