The number of days of chemotherapy for pancreatic cancer depends on the different chemotherapy regimens: 1. If the chemotherapy regimen is gemcitabine plus cisplatin, generally gemcitabine is given on days 1 and 8, while cisplatin is generally given on days 1, 2 and 3 in three doses. 2. If the chemotherapy regimen is single agent oral tegretol, generally it is taken for two consecutive weeks with one week of rest. 3. In the case of a chemotherapy regimen of tegeo plus tegeo, tegeo is usually taken for two weeks, while albumin paclitaxel is usually given on the first day of chemotherapy.4. In the case of a single oral capecitabine chemotherapy regimen, it is usually taken for two weeks on days 1, 2 and 3, followed by a one-week break before starting the next course of chemotherapy. Chemotherapy for pancreatic cancer, like other chemotherapy, is associated with varying degrees of myelosuppression, nausea, vomiting, etc. The chemotherapy regimen may vary from drug to drug, and it has different side effects. It is necessary to regularly monitor and recheck the blood routine, liver and kidney function, as well as to actively review and evaluate the efficacy every three cycles, and then decide the next treatment plan based on the evaluation results.