The operation time of rectal cancer is usually about 2-3 hours. At present, many rectal cancers are operated by minimally invasive surgery, that is, the rectal tumor is removed under laparoscopy, and the operation time is about 2 hours, of course, anesthesia is needed before the operation, and anesthesia recovery is also needed after the operation, which takes about 1 hour, so the overall total is about 3 hours to complete the operation. Of course, if the patient’s tumor is late and the operation is more difficult, the operation time may be extended appropriately. If the patient’s tumor is in a low position and cannot preserve the anus, that is, the perineum needs to be removed, the operation time may also be extended appropriately, about a little more than three hours, basically, it can be done.