SCCM: Stopping mandatory reboot

Recently I had an issue where a system that is running a critical data restore is schedule for a mandatory reboot after a patch installation. The reboot countdown starts at 3 hours and that is not long enough for the data restore to complete.

So here is what I found from the internet how to stop the mandatory reboot in case you are in important session and reboot is not an option.

1. Launch CMD as admin and run shutdown /a. This will cancel all reboot command scheduled by SCCM. 
2. Stop SCCM service by running net stop ccmexec in the same CMD window or you can launch the Services.msc window and stop SMS Agent Host service. 

This will close the SCCM restart notification.

Hope this help when you are in critical situation.

Source: http://thecramers.us/hacking/how-to-stop-a-mandatory-reboot-following-software-updates/