My experience may be a little different because I teach in a right-to-work state. However, you clearly have no idea how a GOOD high school teacher works. I spent Christmas break writing lesson plans.
This summer, I spent 1 week, 8 hours per day plus homework, in a training course on teaching AP Calculus BC (Calculus 2). I attended graduate school full-time each of the last three summers, and spent weeks writing lesson plans and tests. I'm spending the MLK weekend grading 150 calculus and precalculus papers.