I think it may depend on the kid, but I give my boys about a half hour to eat something and they sit and watch tv, then they do their homework between about 4 and 5. Now, my kids are in 2nd and 4th grade ( this one is special needs) so they don't have much homework.

I guess I just think if it was me coming home after a 7 hour day, I would want a little break too. However we do try to get it done before dinner because I don't like homework "suprises" where something big is due the next day!