Well, my take away is that other’s have it comparatively easy to how we had it.
I don’t know anyone from my CS-programme that got by on anything less other than essentially studying more than full-time.
Today, I’m a professional, working on harder stuff than what we did then but even so - going back, then I would probably not be able to finish even half of the coursework by only putting in three hour days and that is solely working on assignments (disregarding lectures and exam studies).
To clarify, we normally took two courses in parallell, and so in essence one course should take 20hrs/week and vice versa. To be fair, courses are scheduled so that if one is more intense, the other is a bit more lax to compensate. I usually put in about twelve hours of work every day during my studies. And I was an above average student, which also I suppose cost me some efficiency as I wouldn’t settle for just barely passing.
But even the most lax ones that got through were at least on campus from 9-18, with added work during the weekends - especially during exam season.