The surgery time for gastric cancer depends on the disease condition. For some small tumors, the surgery is easier to remove and the surgery time will not be long, about 2-3 hours. If the tumor is large, invasive and has lymphatic metastasis, not only the tumor should be removed, but also the lymph in the metastatic area should be cleared. In the process of removal, the major organs must be protected from damage, including the important blood vessels, so the operation will take longer, about 4 hours.