Under normal circumstances, if there are no problems that need to be addressed during a gastroscopy, it can usually be completed in about 3-5 minutes. However, if there are some operations that need to be done, the examination time may be extended. Clinical gastroscopy may be completed in an average of 3-5 minutes for skilled operators from the time the mirror is lowered to the time the mirror is removed. However, if some treatment needs to be done under the gastroscope, it may take longer, such as microscopic pathological biopsy, which may take about 10 minutes. In case of microscopic hemostasis or mucosal debridement for gastric cancer patients, the time may vary depending on the severity of the disease and the proficiency of the surgeon, which may be around 1 hour or longer. The time for gastroscopy mentioned above is only the time for mirror alone, excluding the time for local anesthesia, which usually takes about 10 minutes.