[Kenny Loggins]

Maybe give this a try and just set the time you would like the server to restart at. Use _restart as the command and while I didn't look over every post I'm sure this should work with tf2

http://forums.alliedmods.net/showthread.php?p=769779

Or you could use this.

http://forums.alliedmods.net/showthread.php?p=523298