Blocked time settings didn't work

I installed the new version of safety minder and set up the blocked hours for my son to be 10pm until 6am on sun-thursday, and 11pm to 6am Fri and Sat.

 

Monday night he was on the computer before 10pm and stayed on until about 10:40pm.  There were no warnings.  What is supposed to happen?  Does it just not allow him to log on during those times?  But if he is already logged on, what then?