A colonoscopy can usually be completed in less than 20 minutes. Colonoscopy is a test to check for colon lesions. During the examination, a colonoscope is inserted through the anus into the ileocecal area, and the mucosa of the colon is observed to determine whether there are any lesions in the colon area, and colonoscopy can generally examine the entire colon area. The colonoscopy can be performed within 2 minutes, the colon can be examined in about 10 minutes, and it usually takes at least 6 minutes to exit the colonoscopy, so the colonoscopy usually takes about 20 minutes to complete. The colonoscopy can be completed within 20 minutes, but in difficult cases, the time will be increased accordingly, and it is recommended that the colonoscopy be performed in a regular large hospital.