I did two years of school, but didn't know what I wanted to pursue (initially I wanted to be a teacher, but didn't work out). I lost motivation and grades started falling (and it's an expensive way to find a career) so I dropped out. I worked a few jobs over the next few years, figured out what I wanted to do and then went back to school. I had basically completed all my basic courses in my first two years and finished my degree in another two. Not the quickest way to figure life out, but it seemed to work.
That said, my parents didn't pay for my education. Maybe that changes how things are done?