A colonoscopy takes an average of 15 to 20 minutes to perform, depending on the experience and skill of the doctor, the quality of the colonoscopy, and the patient’s size, lesions, and level of cooperation. The more experienced and skilled the doctor is, the more skillful his movements are and the faster the lesion is detected, so it will take less time. A colonoscopy involves taking pictures of the lesion, and if the patient’s lesions are extensive, the sampling time will be prolonged. If the hardness of the colonoscope is appropriate, not too hard and not too soft, it will be favorable to run in the intestine, so the time will be shorter. If the patient is obese, the length of the bowel in the abdominal cavity is longer, and the pressure is higher due to the narrowing of the bowel caused by the squeezing of the fatty tissue, which is not conducive to the movement of the colonoscope for exploration, the time taken will be longer. The process of inserting the colonoscope into the patient’s anus and probing inward during colonoscopy is more painful, especially for non-anesthesia colonoscopy patients if they can’t tolerate the pain will prolong the time spent. The above introduction is for reference only, please follow your doctor’s instructions.