Generally speaking, painless gastroenteroscopy usually takes 20-60 minutes to do, which is related to whether endoscopic treatment is needed, the complexity of endoscopic operation and the degree of patient cooperation. 1. Whether endoscopic treatment is needed: painless gastroscopy without endoscopic treatment generally requires only a few minutes to ten minutes of operation. Painless colonoscopy without endoscopic treatment usually takes about 20-30 minutes to operate. For painless gastroenteroscopy that requires endoscopic treatment, the operation time will be extended accordingly, and the specific length is not certain. 2. The complexity of endoscopic operation: if the patient’s condition is complicated and serious, the endoscopic operation is more complicated, then the time is about half an hour. If the condition is mild and single, the complexity of endoscopic operation is small, and the operation can be finished in ten minutes. 3. Patient’s cooperation: if the patient’s cooperation is high and the progress is smooth, the time is usually shorter; if the cooperation is low and even impossible to complete, then the time is variable.