Somewhat off topic, but I doubt very much there are any professors at state schools specializing in research that spend anywhere near 55 hours a week on their classes. Maybe he meant per month.
Because introductory CS enrollment has ballooned so much recently, many professors for large introductory CS classes nowadays are full-time lecturers that do not conduct any research. Many full-time research faculty only teach smaller, upper-level classes.
In my experience, this works out pretty well since many of the full-time lecturers do dedicate a lot of their time to teaching (55 hours is totally believable depending on teaching load) and do a really good job of it.
I can confirm that he does. He is a full time lecturer for 3 or 4 classes a semester and produces a staggering amount of material. He is careful to never repeat assignments and each one requires detailing the project, creating automated tests, creating all sorts of frameworks for them(eg, import this jar and pass the instance of your game logic to this black box and you'll have an interactive Swing application to play the game). He plans out his lectures thoroughly and has 2-4 hours of them a day. This doesn't even cover office hours or meetings.
I never really realized how much work a good lecturer does until I was a TA under them. I have so much more respect for people teaching introductory classes now.
In my experience, this works out pretty well since many of the full-time lecturers do dedicate a lot of their time to teaching (55 hours is totally believable depending on teaching load) and do a really good job of it.