From tweakxp.com
Quote:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services \W32Time\TimeProviders\NtpClient
2. Select "SpecialPollInterval"
3. Change decimal value from 604800 to some other value in seconds. EX: 172800 (2 days)




Try this, but change the value to something like 6 hours. Also, change the server to something other than time.microsoft.com


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