Answer:
Arizona has no laws that limit the amount of homework a teacher may assign. There are no federal laws limiting homework assignments, either.
Some studies suggest that a ten-minute-times-grade-level formula is the best guide. So, a first-grader ideally would get no more than ten minutes (10 x 1) of homework to do, and a high school sophomore--a tenth-grader--would get no more than a hundred minutes (10 x 10) of homework to do each night.
What this means to you:
Your teacher may assign as much or as little homework as he or she thinks is appropriate.