You usually configure Group Policy update times under the Computer ConfigurationAdministrative TemplatesSystemGroup Policy and the User ConfigurationAdministrative TemplatesSystemGroup Policy branches; however, you can also directly set the registry to configure Group Policy update times by performing the following steps:
Start regedit.exe.
Go to HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsSystem to set Computer refresh. Or, alternatively, go to HKEY_CURRENT_USERSoftwarePoliciesMicrosoftWindowsSystem to set User refresh.
Create a DWORD value with a name of GroupPolicyRefreshTime, and set it to a number between 0 and 648000 minutes.
Create a DWORD value with a name of GroupPolicyRefreshTimeOffset, and set it to a number between 0 and 1440 minutes. (You specify an offset value to prevent many clients from trying to refresh at the same time.)
Close regedit.