For difficult coursework where you really need to learn the material inside and out in order to have any chance of success in the next course in the series, the lecture:study ratio needed is about 1:3.<p>If one is taking three such courses, perhaps ten hours in lecture per week, then around four hours a day, seven days a week will be needed for study. (It's true that some people grasp material quicker than others, but often that's because they've had some prior introduction to it.)<p>This is pretty demanding and it's why a lot of people switch their majors to something less time-consuming. However, this lecture:study/practice ratio is entirely normal for vocational programs, e.g. learning to weld, etc.<p>"If I hold up one corner of a square and the student cannot workout the other three for himself, I won't go any further." - Confucius