I know it could be done but I would say it depends on what school and major you go in. I go to SDSU, population of close to 35,000 and have an impacted major. I'm lucky enough to even get one science class a semester in my schedule, that's how bad it is. Plus for certain majors, there aren't enough teachers to teach the subject. So even if I wanted to graudate in 3 years (and I don't) I would have to bounce from SDSU and a community college.
Too much stress, I got enough on my plate. All that matters are my grades and clinical experience, not how fast I can complete my requirements.