At my house, I'd cut Art, Civics (I know you can't, but I am not under any restrictions). I would reduce the time for the rest you cycle. Logic, Etiquette would total 45 minutes a week at most, Science would be 60 minutes a week (two 30 minute slots) and History would be 60 minutes each week. I don't count reading or music in my school time.
If you and your kids do not mind putting in that much time each day, then don't feel the need to change things. *I* could not do that. I would crumble.