Chemotherapy is typically given in cycles, which is a treatment followed by a period of rest. A cycle can last one or more days, but is usually one, two, three or four weeks long. A course of chemotherapy is comprised of multiple cycles. Each course is different, but generally consists of four to six cycles. The actual administration of the chemotherapy drugs may take minutes to several hours, depending on the drug or drugs given. If your chemotherapy is given through an IV, your doctor may suggest an implanted venous access device (VAD) or Port-a-Cath. VADs are surgically placed in a large vein near the heart and can stay in place for long periods of time. By using a VAD you will not have to have smaller catheters repeatedly placed in arm veins.