Every school system sets its own vacation days, and home schooled kids don't share the same set hours or days as the local school districts.

I don't doubt that the harms are real, but I do suspect that you are putting an unreasonable burden on tik tok here.

What I'm actually most curious about is when did schools start letting kids have cell phones during the school day? I was in school roughly just before smart phones were a thing, but texting was starting to become popular if you could get a plan that didn't charge per text.

The expectation was your phone stayed in your locker if you brought it to school, and anyone caught with one during class or in the hallways during class hours would have it taken away until the day was over.