A regular colonoscopy is usually done in about 13 minutes and a painless colonoscopy may take about 20 minutes. If there are lesions in the intestines, the examination time may increase accordingly. Enteroscopy is widely used in gastroenterology, mainly gastroenterologists use instruments and equipment to observe the rectum, colon, cecum and ileocecal valve, ordinary colonoscopy is usually completed in about 13 minutes, while painless colonoscopy requires anesthesia and may take about 20 minutes, if the examiner is thin or there are lesions in the intestinal tract, it is necessary to take a biopsy of the pathology, and the time for the examination may be increased accordingly. It should be noted that before the colonoscopy, you need to do a good job of intestinal cleansing in advance, so that in the process of the examination can save time and make the field of vision clear, more conducive to the observation of the doctor.