The average semester lasts about thirteen to fourteen weeks. Assuming a week spent grading, the average tenured professors work six months out of the year. During this period in elite schools, they may teach one or two classes a week, about six hours in the classroom or as much as twelve hours a week in the least prestigious. The professor is teaching a subject he is an expert in, so over time preparation approaches zero hours, and in universities with graduate programs the grading is done by graduate students. The professor is expected to do research and publish, and some do, while others,
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