Medical residency lasts three to seven years after medical school, depending on the specialty. The shortest programs, like family medicine and internal medicine, take three years. The longest, neurosurgery, requires seven full years. Most physicians spend an additional one to three years in fellowship training if they want to sub-specialize.
Residency Length by Specialty
Every specialty sets its own training duration, and the range is wide. Here’s how the most common residency programs break down:
- 3 years: Family medicine, internal medicine, pediatrics
- 3 years plus a preliminary year: Anesthesiology, dermatology, neurology, ophthalmology
- 4 years: Obstetrics/gynecology, psychiatry, pathology, diagnostic radiology (plus a preliminary year)
- 5 years: General surgery, orthopedic surgery, otolaryngology (ENT), urology
- 6 years: Plastic surgery
- 7 years: Neurosurgery
A few of these need some context. Several specialties list “three years plus a preliminary year,” which means you spend your first year doing broad clinical rotations (often in internal medicine or surgery) before starting your specialty-specific training. That preliminary or transitional year counts as postgraduate year one (PGY-1), so the total time in residency is actually four years, not three.
Emergency medicine is one of the few specialties with variable length: some programs run three years, others four, depending on the institution.
What Surgical Training Actually Looks Like
Surgical residencies are among the longest and most structured. General surgery requires a minimum of 60 months (five years) of progressive training. The American Board of Surgery mandates at least 54 of those months be spent in clinical surgical work, with no fewer than 42 months dedicated specifically to general surgery content areas. Residents must serve as chief resident for a minimum of 48 weeks across their final two years, and the last two years must be completed at the same program.
Neurosurgery sits at the far end of the spectrum. The American Board of Neurological Surgery requires 84 months of training in an accredited program. That’s seven years of residency alone, before any fellowship. When you add four years of medical school and four years of college, a neurosurgeon may be in their mid-thirties before practicing independently.
Combined Residency Programs
Some physicians train in two specialties simultaneously through combined programs. The most common is internal medicine-pediatrics (often called “med-peds”), which takes four years instead of the six it would take to complete both residencies separately. Graduates are eligible for board certification in both internal medicine and pediatrics.
Other combined tracks exist as well, pairing specialties like emergency medicine with internal medicine or psychiatry with neurology. These programs typically save one to two years compared to training in each field sequentially, though they pack significantly more material into the time you do have.
Fellowships After Residency
Residency trains you in a broad specialty. Fellowship trains you in a narrow slice of it. If you want to become a cardiologist, for example, you first complete three years of internal medicine residency, then apply for a separate three-year cardiology fellowship. That’s six years of postgraduate training minimum.
Fellowship lengths vary by sub-specialty. Cardiology, gastroenterology, and hematology/oncology fellowships each run three years. From there, some physicians pursue even further sub-specialization: interventional cardiology adds two more years, advanced endoscopy adds one, and transplant hepatology adds one. A physician who completes internal medicine residency, a gastroenterology fellowship, and an advanced endoscopy fellowship has spent seven years training after medical school.
Surgical sub-specialties follow a similar pattern. A general surgery resident who wants to specialize in vascular surgery or surgical oncology will tack on one to two additional fellowship years after their five-year residency.
Research Tracks Add More Time
Physicians pursuing academic or research-focused careers sometimes enroll in physician-scientist training programs, which build one to two years of protected research time into the residency. This research period is woven into the training timeline, meaning a three-year internal medicine residency could stretch to four or five years for someone on a research track. These positions are competitive and typically aimed at residents who plan to split their careers between patient care and laboratory or clinical research.
Work Hours During Residency
Residency is not a typical job, and understanding the weekly grind helps explain why even a “short” three-year program feels long. Current rules from the Accreditation Council for Graduate Medical Education (ACGME) cap clinical and educational work at 80 hours per week, averaged over four weeks. That average includes moonlighting and clinical work done from home.
Continuous shifts cannot exceed 24 hours of scheduled clinical work, with up to four additional hours allowed for patient handoffs and education. After a 24-hour in-house shift, residents must have at least 14 hours free before their next clinical assignment. On a regular basis, residents should get eight hours off between scheduled work periods and must have at least one day per week free of clinical duties and required education, averaged over four weeks. In-house overnight call can be scheduled no more than every third night.
These limits were introduced because residents historically worked far more, sometimes exceeding 100 hours per week with 36-hour shifts. Even under current rules, working 70 to 80 hours a week for three to seven years is physically and mentally demanding.
Total Timeline From College to Practice
The full picture puts residency length into perspective. Before residency even begins, you complete four years of college and four years of medical school. Adding residency and potential fellowship training creates a wide range of total training time depending on your chosen path:
- Family medicine physician: 4 (college) + 4 (medical school) + 3 (residency) = 11 years
- General surgeon: 4 + 4 + 5 = 13 years
- Cardiologist: 4 + 4 + 3 (internal medicine) + 3 (fellowship) = 14 years
- Neurosurgeon: 4 + 4 + 7 = 15 years
- Interventional cardiologist: 4 + 4 + 3 + 3 + 2 = 16 years
These are minimums. Research years, preliminary years, or time spent earning additional degrees like a PhD or MPH can push the total even higher. A physician-scientist who completes an MD-PhD program (typically seven to eight years), then a five-year surgical residency, may not finish training until their late thirties or early forties.