Time report incorrect

Hi,

when viewing  the "time report" tab for today, one of my children is erronously reported as having spent 9 1/2 hours at the computer. The limit was actually 4 hours and the computer was locked by Norton at that time (after a couple of 1-minute login/logout attemps from my child). 

 

Since the account was locked, but not actually logged of from: does Norton keep counting time even though the account user is not able to access the computer? That would not be very useful.