Is it possible to extend the valid range to the DOS shutdown command in Windows Server 2003? The help shows a maximum time-out period at 600 seconds.
Not possible. However, as an alternative, you could create a scheduled task to run
shutdown.exe x number of seconds from the current time, using a powershell script. Or, better yet, use powershell’s
set-sleep in a script to delay executing
shutdown.exe until You’re ready.
You can try using the at command to push it off to a later time:
at 9:30 shutdown -t 30 -f -s