Colonoscopy is divided into general colonoscopy and painless colonoscopy, different ways, the time used is not the same, usually in about 30 to 60 minutes can be done, if you need to take pathology biopsy or the patient’s cooperation is not good, may extend the time accordingly. 1. Ordinary colonoscopy: ordinary colonoscopy does not require anesthesia, if the process is smooth, the whole process about 30 minutes. Doctors who are more skillful in the operation may be able to finish it in 20 minutes. However, if the doctor is unable to continue the process due to discomfort and poor cooperation of the patient during the process, it may take more time to complete the examination. 2. Painless colonoscopy: Painless colonoscopy usually requires anesthesia, and after anesthesia, the patient needs to have anesthesia recovery time, which takes a relatively long time and may take about 60 minutes. It should be noted that the contents of the intestines need to be emptied before doing colonoscopy. If the vision of the doctor’s operation is not clear due to inadequate preparation of the patient, the colonoscopy may be affected, and it is recommended to strictly follow the doctor’s instructions for the preparation before the examination.