Cruel and unusual punishment created simply to make students unhappy, and to distract them from thinking about the opposite sex, the internet, their friends, the mall, the TV, or any other possible forms of entertainment. It's work, reviewing tedius classes that you sat through or talked through, or slept through in school. Usually homework takes many hours, unless you have "very little homework", which is also related to heavenly.
"Guh, I have so much damned homework tonight, I don't think that I can go over April's house. Doesn't that suck?"