You want to restrict a users ability to login to specific time This restricts the times a user can logon to the system.

C>:net user (username) /time:(day to start)-(day to end),(time to start)-(time to end)

The days are m/t/w/th/f/s/su.

It will not restrict users from using a computer they have already logged into.

examples net user /time:M-F,08:00-17:00 net user /time:M-F,8am-5pm net user /time:M,4am-5pm;T,1pm-3pm;W-F,8:00-17:00 net user /time:all