Yet another ignorant remark from you. A teacher's working day does not end at 3 p.m. There are papers to be graded, new lessons to be written, supplies to be purchased, parents of miscreants to be called, mandatory meetings to attend after school, etc. I taught in urban high schools for 25 years and often did not make it to bed before midnight. I was a very dedicated teacher and put everything I could into my lessons and activities. This time after school hours more than balanced out summer vacation. Such intense daily activity with a bunch of kids who do not want to be there requires a recharge of one's batteries. But I still spent a lot of my summer researching material for new lessons in the fall.
They are really putting in the hours in June, July, August, Christmas break, fall break, spring break, all holidays, personal time. Give me break. It’s a part time job.