Here’s a link to some very good articles regarding Group Policy Refresh Cycle:
http://trycatch.be/blogs/roggenk/archive/2008/06/19/understanding-group-policy-and-preferences-refresh-cycles-part-1.aspx
http://trycatch.be/blogs/roggenk/archive/2008/06/23/understanding-group-policy-and-preferences-refresh-cycles-part-2.aspx
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