Minimize the System Shutdown Time

Follow these steps:

(Generally, the default time for the system to shutdown is 20 seconds. You can minimize the time even for 5 seconds.)

Open Registry editor (start > Run> then type "regedit" (without quotes) and press enter button
this will open registry editor
then follow this path  ...

HKEY_CURRENT_USER\Control Panel\Desktop.

On the right pane you can find a string value  "WaitToKillAppTimeout"


Double click “WaitToKillAppTime” and modify its default value 20000 to 5000 and click the OK button

Logoff / Restart to see the changes. 

Wrong settings in the registry may cause an unpredictable problems to your Windows. So carefully change the appropriate values.