I'm sure I'll be in the minority -
My DD had 3-4 hours consistently in 7th grade. She is very efficient, so I know she wasn't procrastinating. She made a decision to drop sports but is an accomplished musician, practicing 1 hour a day on average.
I think as long as it is not busywork, homework can be valuable. The work they were doing was challenging - reading/analyzing primary sources, writing essays, studying vocabulary, learning classification of bacteria, etc. I think DD has better study habits now than I had in college.
I guess I would ask about the quality of the work. Two hours of inane worksheets isn't going to help develop study habits, but thoughtful writing exercises might.