One chemotherapy treatment for rectal cancer takes about 2-3 days, including intravenous chemotherapy and oral chemotherapy, and intravenous chemotherapy usually requires intravenous infusion, either in peripheral veins or central veins. When patients are admitted to the hospital, they should undergo a general examination, which usually includes routine blood tests, biochemical tests and coagulation tests to find out whether there is a decrease in white blood cells and whether there is bone marrow suppression. If the patient’s examination results are normal, chemotherapy drugs can be given on the second day, and if the patient does not show any obvious abnormalities and the relevant indexes do not drop significantly on the third day, the patient can be considered for discharge in about 2-3 days. If the patient has a heavy gastrointestinal reaction during chemotherapy, not able to eat, nausea, vomiting, you need to be hospitalized for 2 more days for observation, most of them can be discharged in about 5-7 days.