shutdown timer

Or else you can run scripts through command prompt like this

and simply add "shutdown \s" for more

Have a option in Test Complete to shutdown the system Sys.Shutdown().

Just put this code event handlers like OnStopTest then after completion of test system will be shutdown.

Some helpers on Event handlers here

Some helpers on Shutdown here

NOTE: If you put Sys.Shutdown in your handlers every time you run the test system will get shutdown when execution over.