I can't speak to the professor's hours exactly, but if you are tenured, you are talking, but certainly not limited to: prep time, grading, advising, faculty committees, professional development, grant writing, research (publish or perish) as well as any community/school partnerships that frequently occur. You are also expected to be involved with the professional organizations connected with your content area on a regional and national and sometimes international level as well. That sure seems pretty time intensive.
I can speak to a coaches schedule. Even those with full staffs as permitted by the NCAA routinely put in close to 100 hour weeks quite frequently during the school year. If you are the Director or Head Coach of all 3 sports (CC, Indoor, Outdoor) you are in season the entire school year. That means you are overseeing the following: training your event group(s), recruiting (which has multi year layers), eligibility, travel, fundraising, the assistant coaches, graduation rates, NCAA rules regarding everything you do, community relations, alum relations, professional development etc. Of course the great coaches effectively delegate many tasks, but they still have to oversee the entire operation and that is very time consuming. Coaches at the top of the NCAA standings are expected to remain there or they won't continue to make the kind of money that Coach Floreal, Henry etc. make. As another posted stated, prior to Coach Floreal arriving, UK wasn't that big on the national scene and now they are very prominent. In looking at their current roster, UK has what appears to be 68 people on their rosters total. If they are at the NCAA limits for both genders, that makes 37.4 students who are not getting any athletic aid. I would predict that many of them are on academic or need based aid, but even with that, you are looking at a significat influx of $$ to the university's general funds. Add that to the fact that people who graduate with an athletic affiliation tend to be bigger donors and it's a pretty nice situation for the school. Given all that, one could say that the track and field coaches are somewhat underpaid since they are the primary recruiters of the athletes to the school in nearly every case.