Most students attend for 8 semesters. Some who had a ton of AP, dual enrollment, and CLEP credits finish earlier. Yes, some students who are under financial pressure, do finish earlier. I know someone who persuaded his parents to let him stay an “extra” 5th semester (not year, semester), because he didn’t want to leave after only 4 semesters - he could have finished up at the end of the 4th semester.
So the answer is, it depends. Frankly, I think that finishing an undergrad degree in 7 semesters is pretty darn good.