WSUS Automatic Patch and Reboot in Offline Hours

Hello,

I'd like to patch and reboot some of our servers automatically in the offline hours, configured by GPOs. I have managed to get the patches installed and defined a active window. But the servers don't reboot. 

On issue could be the active window. On the GUI the maximum active window can be max 18h. Is this also valid if you set the window per GPO?  As I want to have a very narrow window for the reboots so I need a active window e.g. 22h. Also the start could be ater than the end as I want to cover midnight. E.g. active window starts at 4:00 and ends 2:00 so retarts could be triggered between 2:00 and 4:00

Thanx

__Leo