i dont think it was cause he was playing too much and he was trying to watch the hours. they had a agreement about passing science. buck said if he failed science, losing xbox live was punishment for the summer. not just that he was playing too much.
i vote dont give him any hours. when i grew up at home when i messed up and got punished it was worse then losing video game hours. got grounded from friends, games, and was made to do my parents chores and yard work that they normally did or i would do for allowance, but instead for no money and as punishment. i say you stick with him losing it completly for the summer. it sucks and everyone wants to be the cool dad but there is always a time and place to be your kids friends and then their parents.
but if u want to give him that one hour a day, i dont know a for sure answer on the parental lock but try xboxforums.com there is chatter about everything on that site im sure there would be a tutorial or something there. if not i say just take it away period and put it in ur room for the summer lol and tell him he shoulda passed science