How long does a colonoscopy take?

How long does a colonoscopy take?

The colonoscopy itself usually takes 20–30 minutes, but the full clinic visit is 1–2 hours, and the home preparation starts 3–4 days before. Here is the complete time picture so you can plan the day and time off work realistically.

Quick answer

Phase	Time
Low-residue diet	3 days before
Bowel prep at home	Afternoon and evening before
Total clinic visit	1–2 hours
The colonoscopy itself	20–30 minutes (up to 45 in difficult anatomy)
Recovery after sedation	30–60 minutes
Recovery at home	Rest of the day

The procedure itself: 20–30 minutes

The time during which the scope is inside the bowel is usually 20–30 minutes. The doctor passes the scope all the way around the colon to the caecum, inspects again as the scope is withdrawn, and removes any polyps along the way. In about 98% of cases the doctor reaches the caecum. In the few cases where anatomy is difficult (a long bowel, many curves, previous surgery), the procedure can take up to 45 minutes or be supplemented with a CT scan.

The full clinic visit: 1–2 hours

Even though the procedure itself is short, expect to spend 1–2 hours at the clinic. This covers:

• arrival, changing and a short conversation: about 15 minutes
• the colonoscopy: 20–30 minutes
• recovery after sedation: 30–60 minutes until you are ready to go home
• review of findings with the doctor: 10 minutes

If you do not have sedation, you can leave sooner, but most people choose sedation and need to allow that time.

Home preparation: 3–4 days

The preparation starts long before the procedure:

• 3 days before: low-residue diet, no seeds or fibre
• 2 days before: softer food, more fluids
• day before, until noon: last small solid meal
• day before, from the afternoon: bowel prep with Picoprep or MoviPrep and clear fluids only
• day of the procedure: clear fluids only until 2 hours before

The bowel prep itself takes 3–8 hours to work, and you need to stay close to a toilet for the whole period.

Recovery after the colonoscopy

Plan the rest of the day after the colonoscopy as a rest day, especially if you have had sedation. Most people are back to normal the next morning and can go to work, but:

• you cannot drive a car, ride a bike or operate machinery for the rest of the day
• avoid heavy physical work and hard training for 24 hours, especially if polyps were removed
• eat soft and light the day after if your stomach feels sensitive

What affects the time?

• Bowel anatomy. A long or tortuous colon takes longer to scope
• Previous abdominal surgery. Adhesions can make passing the scope harder
• Number and size of polyps. Each polyp adds 2–5 minutes
• Sedation. Requires longer observation afterwards
• Quality of the bowel prep. A poorly cleaned colon means extra time to wash and inspect

Do I need to take a full day off?

Yes, plan at least one full day off. The day before, the bowel prep is intense enough that most people cannot work from the afternoon. On the day of the procedure you are at the clinic and then home to rest. The next morning you are usually back to normal. If your work involves driving or operating machinery, allow the next day too if you had heavier sedation.

Next step

Read the full colonoscopy patient guide for the entire pathway step by step, or the separate guide on a low-residue diet before colonoscopy if you are looking for the concrete meal plan.