I got my undergraduate degree in three years (because that was the way it worked), I then did my doctorate in three years.
For the undergraduate since three years was how things worked there wasn't really any choice, but the important thing was that in the first year everything I did at school I was assumed to have mastered plus the reading in the summer before. We went fast onto new stuff from day 1.
For my doctorate I did pure research in computer science and I had a grant that covered my expenses for three years. I damn well got the thing done in three years rather than run out of money.
For the undergraduate since three years was how things worked there wasn't really any choice, but the important thing was that in the first year everything I did at school I was assumed to have mastered plus the reading in the summer before. We went fast onto new stuff from day 1.
For my doctorate I did pure research in computer science and I had a grant that covered my expenses for three years. I damn well got the thing done in three years rather than run out of money.