What evidence would most weaken the counterclaim presented here? One generally accepted rule of thumb is that students should do ten minutes of homework per night for each grade level. Countless studies have shown that many students find homework to be boring, tiring, stressful, and frustrating. The time required to grade homework is yet another task that diverts a teacher’s attention from actually teaching. It is nearly impossible to know if the completed homework actually belongs to the student or has been copied from another.