Painless colonoscopy refers to the colonoscopy performed after general anesthesia is applied to the patient, and it generally takes about 2 hours from the time of anesthesia to the end of the colonoscopy. When patients undergo painless colonoscopy, they need general anesthesia, and after anesthesia, they need cardiac and electrical monitoring to clarify the patient’s physical condition, and it generally takes about half an hour from the beginning of anesthesia to the end of anesthesia. At this time, colonoscopy is performed, and the enteroscope is accessed through the anus, which clarifies the condition of the intestinal mucous membrane, and it is generally necessary to check whether there is inflammation, rupture, obstruction, polyps and masses, etc, and it generally takes about 1 hour. Patients generally can’t regain consciousness soon after painless enteroscopy, and need to be observed for about half an hour before patients can return to normal, so generally painless enteroscopy takes about 2 hours.