average hours college professors spend in the classroom per week
You can go back to a publication in 1942 by W.W. Charters. In this piece, the median hours per week for a Professor was 58 hrs (yikes!) with Associate Professors reporting 52 hrs per work week, and Assistant Professors clocking in at over 60 hrs per week.
In higher education, a well-established rule of thumb holds that students should devote two hours of study time for every hour of class time. Assuming a full-time load of fifteen credit hours, students adhering to this standard should spend thirty hours per week studying. But since its first national administration in 2000, the National Survey of Student Engagement (NSSE) has found that the average full-time college student falls well short of that standard.