Set the Maximum wait time for Group Policy scripts to 1800 seconds. The default is 10 minutes (600 seconds) but %BRAND_OFFICE_SHORT% ...

Set the Maximum wait time for Group Policy scripts to 1800 seconds. The default is 10 minutes (600 seconds) but %BRAND_OFFICE_SHORT% installs take just over 10 minutes on a local network and longer if the fileshare is remote to the client computer. The script will be canceled if it takes over 30 minutes, so you may need a higher value for your network.