when i was in school, almost all of my 3 credit classes, were MWF so it was sometimes possible to get tues/thurs off but those days were normally spent in my profs office, or in the comp lab working with others to get shit done.
And there are few things more frustrating than spending 2-3 hours on something and getting almost nowhere.  Time managment is great and all, but a lot of times just trying to figure out how to do the damn problems takes most of the time, let alone actually working them.
I am not trying to complain about not being as smart as other(im in the 50th percentile from my experience in terms of intelligence), i learned to accept it and try and work with them as much as i could.  I just think that when folks like logan make it seem easy to do engineering and ski 3-4 days a week, it is misleading.  I can see getting in 2 days a week if you are really busting your ass, but then your social life is totally shot.
I would definitly say that you wouldnt want to do engineering if you planned to ski a bunch in college.