Try making a shutdown button, it's simple
Go to desktop, right click and click new shortcut
A windows will appear will appear saying "what item would you like to create a shortcut for"
Enter in the box "shutdown.exe -s -t 1"
Give that a go technically it's a timer and the time is measured in seconds,
Example if you replaced the "1" with "3600" you'd make a one hour shutdown timer.
Right click and click properties, under customise you can change icon if you want to