Originally Posted by tennis_ocd
Another way of looking at this is that a kid should be able to easily handle 15 hrs/wk of tennis and keep up grades. It's the other time demands that can be the issue.
Occasionally my son complains that there is not enough time to hang with friends and play ping pong or go with them to watch ball games. I feel bad for him as I did all that when I was in high school. (I never played any serious sport in my life though).