I would never want to teach at Hogwarts
Sometimes I think about the ridiculous amount of work that Hogwarts professors have to do. There are supposedly about 1,000 students at Hogwarts in an academic year. While I believe O.W.L. and N.E.W.T. grades determine what classes year 6 and 7 students take, it's still statistically possible for a core-subject professor to teach all 1,000 students. That's 1,000 names and faces to remember every year.
So, you're a core-subject professor at Hogwarts, and you either teach 1/2 of each class at once or the entire class at once. If you teach each group of students once a week, you're teaching 7-14 classes a week. If you see each group of students twice a week, you're teaching 14-28 classes a week.
But that's nothing compared to the time you'll spend outside of class grading 1,000 homework assignments every week. Tests seem to occur less frequently at Hogwarts, so you at least don't have to worry about grading those, too. Maybe there are spells to help grade some assignments, but not all of them, or we'd see the professors using those spells in the books. Oi.