That does sound like a tough two days...but the other five days, and all summer off?
This semester, My Wednesdays are also 11-8, but just one class in the evening. And I teach on Friday morning as well. T and Th off. Next semester, I won't have the Friday class - it will be on Wed, so thus the two really long days with three days off. The two-day work week is certainly nice.
As for the summer, well it is nice to have time away from teaching, but what you may not realize is that I am adjunct faculty, not a public school teacher. If I don't work in the summer, I don't get paid. And even during the semesters when I am getting paychecks, I only get paid for my classroom hours. All the grading and planning that I do at home doesn't get compensated.
So those days off? I need those for the other jobs that I have to have to keep myself above the poverty line.