A.L.
I'd say 1-2 hours a night seems right to me. Prior to coming to coming back to school, the children were required to read three books over the Summer and in turn, write two book reports.. They will also have to read for a minimum of 30 mins a night. More homework does mean more work for me, but hey... It's important to me that my son have opportunities and I think a good education only adds to that..
I think it should also be noted that 4th grade is kinda transitional grade in that the children begin to get more homework and therefore, it does throw some of the kids off (mine included) even though he does get straight As.. It took a few months to get adjusted with being in 4th grade and how it carried more responsibility.. could be your child is just adjusting?
best of luck to you