A course of chemotherapy for rectal cancer is 2-3 weeks, depending on the specific chemotherapy regimen. If it is a 2-week regimen, there is a chemotherapy drug that needs to be pumped into the body continuously in addition to the infusion of one chemotherapy drug. The pumping of this chemotherapy drug takes more than 40 hours and you can be discharged when all the chemotherapy drugs are finished. In the case of a 3-week chemotherapy regimen, a 1-day infusion of chemotherapy drugs is required, and 2 weeks of oral chemotherapy drugs are also required, after which if there is no response, you can be discharged to continue taking oral chemotherapy drugs at home. Whether it is a 2-week regimen or a 3-week regimen, the time is counted from the first day of chemotherapy, not from the end of chemotherapy.