Subjects lectured per week
I have never heard of an undergraduate institution inflicting this level of lecturing on a professor.  Perhaps it happens at vocational or associates degree schools, where, e.g., you might be teaching a whole bunch of sections of "database entry" or "machine operation" or something like that?

For my colleagues at institutions offering 4-year degrees, the normal range is:


1-2 classes in a semester at a research-centric institution, where the professor is expected to also be supervising Ph.D. students
3-4 classes in a semester at a teaching-centric institution, where that is expected to be the primary focus.


Depending on the format of the classes, then, that is likely to mean somewhere between 2 and 20 hours of lecturing per week, which is still far less than what you report.