Are we talking 5 days/week or 7 days/week?
I make a good living working approximately 1,000 hours/year as a community college professor. If you divide 1,000 hours by 52 weeks, it's 19.23 hours/week. Based on a 5 day work week, it's 3.85 hours/day.
In reality, I'm on campus 9:00-3:00 (M-Th) for a total of 24 hours. I still take time for lunch, so I'm not actually working a full six hours. Over the weekend, (Fri-Sun). I will have 5 hours of remote work (course management, emails, grading papers). Let's ignore the lunch, round up and call it 29 hours/week.
We are required to have 15 weeks course content over a 16 week semester. Some faculty end the semester one week early. I actually meet during the entire 16 weeks, but will provide "off days" during the semester to give myself and my students a break.
I also have one week of prep for each semester. For me it's 29 hours/week x 34 weeks for a total of 986 hours/year.
I have a Ph.D. and 15 years of experience. It took a few years of streamlining my teaching to get it down to 1,000 hours/year.