It usually takes about 15~30 minutes to do a general colonoscopy, but the exact time varies from person to person. Usually, when doing general colonoscopy, if the patient’s intestinal preparation is sufficient, the fecal water is less, the patient’s body type is moderate, and the angle of intestinal inflection is small, it is easier to operate, and at this time, it usually takes 15~20 minutes to complete the examination. However, if the patient’s intestinal preparation is insufficient, or the patient’s body type is thin, there are intestinal adhesions, long-term constipation, etc., the examination is relatively more difficult, and the examination time may be relatively longer, and it may take 15~30 minutes. If polyps or ulcers are found under colonoscopy and the tissue needs to be removed for examination, the examination time may be even longer. If patients experience persistent abdominal pain and other discomforts after a general colonoscopy, it is recommended that they seek prompt medical attention to clarify the cause of the disease and under the guidance of the doctor.