While I was on vacation last summer Ed Wilson aka Microsoft Scripting Guy asked me if I would like to write a guest post for the Hey Scripting Guy Blog. Of course !! was my immediate response.
And here it is: Weekend Scripter: Use PowerShell to Troubleshoot Group Policy
The script referenced can be downloaded from here http://gallery.technet.microsoft.com/scriptcenter/Get-GPProcessingTime-a124aaf5