Shot down time is mainly affected by the back side running applications. Like we closed some application but it is still running in background. This problem is automatically shown by windows. But one more problem is Windows Shut down time that takes a little more time when you have the Exit Sound enabled.
Try this to disable windows Shut down Sound.
- Go to Control Panel->then open Sounds and Audio Devices->now click on Sounds.
- Now Scroll down in Program Events (Marked with Red Color) and look for Exit Windows.
- Now click once at point marked with green color in picture and choose none
- Now save settings and try your shut down time.