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one time a kid brought this up in 8th grade math and we almost got to leave..
Luckily every college teacher I have ever had all ready knows this and tells us it is ok to leave after 15 minutes anyways!
Best College Advice I ever received
Although I'm not sure about like middle school or high school, I do know that in college, if the professor isn't there within 15 minutes, you are free to leave. :) <<<< Its only in college
NOOOOOO :'( lol