My kids swam in a summer league a few years and during the summer there was practice every day but they only asked for kids to make it 3 days a week, for 6 weeks. Under 8's usually only swam for 45 minutes. There are two nationally ranked swim teams in town, and I don't really know how much they expect. But I know several kids who have ranked nationally, and in order for this to work out they did have to drop other activities and swim almost every day. Not sure they did that till the under 10 group (9 & 10 year olds).
I personally wouldn't have my child commit that much time to one sport at that age, but I do know people who do. Personally, I feel kids need more down time. There is always transportation time that has to be added in, time to do homework, and other activities.
