They also get 2 or 3 hours off each day compared to other workers.
They also get full benefits, as if they worked full hours.
They are also employees for life in many jurisdictions, as long as they can manage not to disrobe around their students - a stricture that seems increasingly difficult for teachers to handle.
And, yes, we've all heard "But I work extra hours on my lesson plans!" and "I went out and bought markers and construction paper for my kids because the mean taxpayers don't want learning to be fun!" etc., etc.
99% of teachers are time serving robots by the time they get tenure.
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If a teacher is walking out the door at 3:00 then they are a lousy teacher. The ones at my kids private school very often work 60+ hours a week (at night and on weekends) and get paid 20% less than public school. They aren't in it for the money.