Right click on your desktop and make a new shortcut. And now type in shutdown -s -t 2000 -c “shutdown shortcut. Here 2000 is the time before shutting down and it will be in seconds. For example I have taken 2000 ( 33 minutes). And now type in the message whatever you want . For example I wrote shutdown shortcut for convenience. So once written press next button and now if you want to rename it , you can do it or keep the same as shutdown. And press next. And now you have the shutdown shortcut ready on your desktop. Open (double click ) on it and it will be in use. The only way to end it is , go to start and then to RUN and type in shutdown -a (here a stands for abort). And it will be ended safely.