* Associate Degree in Nursing (ADN): Typically takes 2 years.
* Bachelor of Science in Nursing (BSN): Typically takes 4 years. This is becoming increasingly preferred by many hospitals and healthcare systems.
* Diploma in Nursing: These programs are less common now, but historically were a 3-year hospital-based option. They're being phased out in favor of ADN and BSN programs.
So the answer is anywhere from 2 to 4 years, depending on the chosen path.