I'm a professor at a research university, meaning I teach but also mentor PhD students and write grant proposals. Find pretty much all of it stressful, and my regular week is between 60-80 hours a week, but it's pretty "flexible" w/r/t my mood. If I am hypo+, I will work over 80hrs/week, if I am in a black depression, I work more like ~40. I find dealing with students one of the most challenging - I have a number of female students who cry in front of me regularly. One time I was a bit off and seeing one of my students cry actually made me cry. These days, I keep more distance. Other than that, colleagues are also difficult. I like the part of my job that involves working on my own .

Interested to hear about the person who has been a high school teacher for 30 years. you don't find students stressful? (I'll write a separate reply I guess).