Very vague approximations:
Full time: you’re looking at 10 hours teaching per week, monthly salary in the 60-90,000 range depending on position and seniority. Plus 6 weeks salary at Chinese New Year: 800,000 to 1.2 million per year. (Lecturers start at a bit under 60,000 per month, but I don’t think many people are hired into that position these days; assistant professors start around 70,000. Full professors max out around 115,000 per month. As @afterspivak said, schools seem to be doing more to get around this ceiling.)
Part-time: you’re looking at around 600-800 per teaching hour (again, varying by school and seniority). Assuming 10 teaching hours just for the sake of making numbers match, let’s say 7,000 a week, so 126,000 per 18-week semester, so about 260,000 for the year. But that’s to some extent “fake” since I don’t think teaching ten part-time hours at one school is very common; people are likely teaching a few hours here, a few hours there, and doing whatever else they can to survive.
I have absolutely no idea what percentage of teaching hours at a typical university are done by part-time vs full-time faculty.
Note as well that university teaching hours are, in my experience anyway, very different from cram school hours. There’s syllabus preparation, marking for assignments and exams, and so on.
Full-time, it’s a good gig. Part-time, it’s not, but teaching a few hours of university here and there can certainly be good for sanity because it can be a heck of a lot more rewarding than a lot of cram school teaching.