Why are you talking about play time? That has nothing to do with it. Parents are holding kids back so that they have an advantage on the Lacrosse field. You are putting kids on a field that could be a year and half older than the kids they are playing. NOT talking about the JV and Varsity level. It is dangerous to have a 5th grader playing against an 7/8th grader. A lot happens to a kid in that time frame. Lacrosse should work like Football. Play your age/weight and prove your age and weight. If you don't make weight, then move up. Takes some time, but it is definitely the right way to go.