I've coached that age group, and I sub every 5 minutes. Gives the kids enough time to get some water and cool down before running like crazy again. I've never had an issue with the sidelines. I know some of the kids like to go off and play pass on the sidelines for a few minutes, so that works out as long as there's room for it. Don't need them kicking balls onto the field.
Oh, and I tell them they have the very important job of cheering from the sidelines. If I can keep them engaged even when they're on the sidelines then great. There are the others that would just like to kick the ball around.
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