How Long Does a Colonoscopy Take?

Quick Answer

The colonoscopy procedure itself takes 30–60 minutes. However, the full experience spans about two days when you include bowel preparation the day before and 1–2 hours of recovery after sedation.

Full Timeline

Phase	Timing
Bowel prep diet changes	1–3 days before
Bowel prep solution (laxative)	Evening before + morning of
Check-in and pre-procedure	30–60 minutes
Colonoscopy procedure	30–60 minutes
Recovery from sedation	1–2 hours
Results (preliminary)	Same day, verbally
Biopsy results (if taken)	5–10 business days

Bowel Prep Timeline

Bowel prep is the most time-consuming part. Your doctor will typically ask you to:

• 3 days before: Stop eating high-fiber foods, seeds, nuts, and raw vegetables
• 1 day before: Switch to a clear-liquid diet (broth, gelatin, clear juices, water)
• Evening before: Drink the first half of the prescribed laxative solution (such as MiraLAX with Gatorade or a prescription prep like Suprep)
• Morning of: Drink the second half of the prep solution, typically 4–6 hours before your scheduled procedure

Split-dose prep, where you drink half the evening before and half the morning of, is now the standard recommendation because it produces a cleaner colon and is easier to tolerate.

What Happens During the Procedure

A gastroenterologist inserts a flexible colonoscope through the rectum to examine the entire large intestine. The scope has a camera and tools for removing polyps or taking biopsies. Most procedures use moderate sedation (conscious sedation with midazolam and fentanyl) or deep sedation with propofol, which allows faster recovery.

If polyps are found and removed, the procedure may take closer to 60 minutes. A straightforward screening with no findings is often done in 30 minutes or less.

Recovery

After the procedure, you will rest in a recovery area for 1–2 hours while the sedation wears off. You will need someone to drive you home regardless of which sedation type was used. Most people feel back to normal within 24 hours, though mild bloating and gas are common for a few hours as air introduced during the procedure passes.

You can typically resume eating immediately after, starting with light, easy-to-digest foods.

Screening Frequency by Age

Risk Level	Starting Age	Frequency
Average risk	45	Every 10 years
Family history of colon cancer	40 or 10 years before relative's diagnosis	Every 5 years
Personal history of polyps	Varies	Every 3–5 years
Inflammatory bowel disease	8 years after diagnosis	Every 1–3 years

The American Cancer Society updated its guidelines in 2018, lowering the recommended starting age for average-risk adults from 50 to 45.

How to Get Results

Your doctor will share preliminary findings with you (or your designated companion) immediately after the procedure, while you are still in recovery. If biopsies or polyps were sent to a pathology lab, those results typically take 5–10 business days. Most practices make these available through a patient portal or follow-up phone call.