Let’s say your network admin blocked the default screensaver timeout to 15 minutes, but you want more…. You can change this timeout by running as an administrator the regedit then use the “Find…” command to look for “ScreenSaveTimeOut”.
It should be under Computer\HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Control Panel\Desktop
The timeout is defined in seconds. Just change the value and reboot.