If anything I think there should be less.
A lot of teachers at the schools I've attended in the past have set homework to match quotas on how much should be set, rather than setting homework because it would actually benefit the students. Getting four hours a night does nothing for a student if only an hour of that time is actually there because it need to be. Plus, being forced to work that hard and guided so rigidly probably makes it harder to work alone when you get older and need to decide what to do yourself.
The best I've done at school has been in a sixth form college environment, where I might get on average 2-4 pieces of work a month and tests every subject. This is because homework wasn't forced when unnecessary for them most part, and it allowed me to actively work towards doing well in my subjects, rather than slugging through boring worksheets. On top of my homework, I could go see my teachers to go through certain topics, find past papers to do, or ask for extra work if I needed it.