I don't know where in the article there was mention of the number of hours he worked in a week. I've conducted several training sessions in the course of my ca

I don't know where in the article there was mention of the number of hours he worked in a week. I've conducted several training sessions in the course of my career, and I can tell you that the time consumed by the actual class/training is a very small portion of the time spent by the one giving it. Preparation time can be 5-20 times as long, depending on the complexity. Now it is true that professors would reuse past materials, however, there is also time going through submissions of attendees, understanding them, and determining a fair grade. I'm not familiar with the US university system, except for what I see in movies/tv programs, so the professor likely had help. That said, 44 hours spent on overhead that also degrades the experience of everyone involved, and as a result can interfere with the actual learning experience, is indeed worth finding alternative approaches for. Instituting a system that by its nature is difficult to cheat is a much better approach.