You should not spend more than 90 minutes per night doing homework. This time should be budgeted in the following manner:
10 minutes looking for your assignment notebook.
10 minutes contacting a classmate for the assignments.
25 minutes explaining to your parents why Mac is mean and just wants to make life miserable for you.
8 minutes in the bathroom (longer if you are a girl).
10 minutes getting a snack.
7 minutes checking out the television
10 minutes telling your parents that Mac never explained the assignment
10 minutes sitting at the kitchen table waiting for Mom or Dad to do the assignment.