The time of nasal endoscopy is 15-30 minutes, and nasal endoscopy includes nasal surface anesthesia and nasal endoscopy operation. Nasal surface anesthesia time is about 5-10 minutes, some patients who are sensitive to pain can prolong the time of surface anesthesia appropriately, after surface anesthesia, the doctor uses nasal endoscopy to check the patient’s nasal septum, lower nasal passage, middle nasal passage, olfactory fissure, upper nasal passage, posterior nostrils and other parts of the patient, if the patient cooperates with the patient better, the nasal passages are more broad, the nose has no obvious obstruction, it may be 2-3 minutes to be completed. Completion. In some patients, if the nasal passages are very narrow, there is more secretion in the nasal cavity or the nasal cavity has turbinate hypertrophy, inferior turbinate hypertrophy or hooked hypertrophy, etc., it is more difficult to operate during the operation, and the time should be prolonged appropriately.