Create a shortcut on your desktop to Shutdown. exe. Right click on the desktop and choose, New > Shortcut, Browse to The Windows\System32 folder and select Shutdown.exe. When the shortcut is created on your desktop, right click it, choose Properties > Shortcut tab and in the Target field, type or paste:
C:\WINDOWS\system32\shutdown.exe -s -t 30
You can change the 30 to however many seconds you want to wait before shutdown.