Step 1.

Right Click on your desktop and choose “New->Shortcut”.

Step 2.

In the box that says “Type the location of the shortcut”,
type in shutdown -s -t 3600
and click next.

Note: 3600 are the amount of seconds before your
computer shuts down. So, 60secs*60mins=3600secs.

Step 3.

Make up a name for the shortcut and you’re done.
You can change the icon by right clicking->properities->change icon-> browse.

More Info:-
To make an abort key to stop the shutdown timer just create
another shortcut and make the “location of the shortcut”
to shutdown -a

Greetz to tEChniiQue