Haha! Okay, thanks! I just didn't know if the government had a defined work week. Both jobs use Monday through Sunday on their scheduling, so I'm going to go with that.
Hmm, sounds like you only want an answer that suits you, not the actual answer, LOL. If you are working more than 20 hours a week (i.e. 20 hours in any 7 day period), you are in breach of your student conditions and should adjust your schedule accordingly.
Those of us who work at universities, or advising people about immigration matters know that students who work more than their restriction allows sometimes have their leave curtailed, and have to leave the country. It is not worth it.