Most schools will let you take more credits each semester, if you are doing well. In that case, many students finish in 3 years. (even less, for some). I would recommend you stick with the traditional program, and just do your absolute best.

If you are going for your masters degree.. that will typically be another 1-2 years. If you are going for your Ph.D (Doctorate), then it will take even longer. For that, 8 years is probably a good estimate.

When you enter into school, you are going for your bachelors degree or associates degree. For bachelors: I know people who have finished in 2.5 years, and people who went part time and it took them 8 years to finish. It depends on your pace. But traditionally, 4 years for this degree.

Associates degree is typically two years.

I am assuming you are going for your bachelors, because that is the traditional path for HS graduates.

Look up your field of study, or your chosen college online and see the suggested time of study.

undergraduate in 4-5 which is standard

accelerated proffesional programs 7

grad school 4 more after undergraduate

PHD 4 more after graduate