Thanks to all the replies. Yes, not having the time to focus is something I worry about, too. I'm hoping that DS9 will explore a variety of activities in elementary school, and start making choices once he enters middle school--I hope this makes sense in the end. In terms of time, last year DS had about 3 hours of free time every weekday after school and all the homework, practice, etc. We arrange a few activities on Saturdays for DS9 and DD4, but Sunday is always completely free. Many of my friends say that this is plenty of free time. I hope we can keep it this way this year but I think it will be very hard.
