How often and how long can you wear circle lenses safely?

I'm getting circle lenses for the first time, and I'd like to wear them everyday to school, so that means about 5 times a week. I most likely will not wear them on the weekends at all. The thing is, I read you're not supposed to be wearing circle lenses for more than 8 hours, and I go to school for 7 hours. I will have to be wearing them a little bit before and after school as well, so that means they're probably be on for a little longer than 8 hours, maybe even almost 9 hours. Is this safe? Should I just not wear circle lenses daily? Or should I switch between circle lenses and contacts each day or something?

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