LockScreen Timer (with Tasker)

Android makes it somewhat difficult to receive the Screen On intent from the system (in order to protect your phone from being overrun with services). Instead of adding another long service to your phone, use Tasker to launch this simple service to hold your lockscreen on for however long you want.

After choosing your time in the UI, in your Tasker task, run this shell command:
am startservice -n com.binarybombtech.lockscreentimeout/.ScreenIntentService