i give classes for kid mma and all my kids take 2 hours or three
For a child anything over an hour is going to be difficult.
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She is a blue belt in BJJ. Did some amateur intergender MMA too. I think her first fight was against a typical red neck kid who she had tap out from a triangle.
Nothing
How should I know? I'm just a kid!
While I would never say never, size is a factor. Someone that large can absorb punishment a lot better than someone small. And the small size makes the forces behind the techniques less effective and damaging. Surprise would be the biggest ally the smaller kid would have. And legally, unless it is self-defense, (surprise is not self-defense) such an attack could result in criminal charges.
Because people would complain. School schedules are usually based around the work schedules of parents. Starting school an hour later would, for many parents, be a major inconvenience ... if you've got to be at work by 9, and your kid's school starts at 9, you're either going to need to drop the kid off early (and have them hanging around the schoolyard with nothing to do and possibly no supervision for an hour; you can imagine just how much the school, the kid, and the parent are going to love that idea) or go in to work late (the school, your kid, and you may be fine with that, but your boss probably won't). Now, if your school starts at some ridiculous hour like 5 AM, you could probably get a lot of parent buy-in for starting it an hour later; few people have such a long commute or an early work shift that they couldn't manage to make it in if they started the commute at 6 instead of 5, and getting up at 5 AM instead of 4 AM is probably going to be an easy sell. However, the closer you get to the time most people have to be at work the more push back you're going to get. Another factor is extracurricular activities, particularly once you get to high school. If school ends at 2:30 or 3, you can keep the kids for an hour and a half for football (or whatever) practice afterwards and no one's going to be terribly upset. If it doesn't end until 4, and then the kids have to stay until 6 or so for practice, you can expect a lot of complaints (especially in farming communities, where the high school kids in particular probably have chores they need to do in the evening).