As a college student, I consistently put in 60-80+ hours a week into my studies. I know this is just one data point, but I think your estimate of what it takes to be a student is way off. However, I do take a lot of classes, and do research, so I may be on the upper end.
That's absolutely insane. I overloaded half my semesters and had a double major-double minor and didn't work anywhere near those hours. Maybe college has changed in the last 10 years, but I went to a very good school and had a drastically different experience. It's insane to believe you should be working more in college than after, let alone double.
Seriously, that's insane. I've never heard of anything even resembling that.
(This is at a state school in the US.)