Six weeks. PICC catheter placement refers to the placement of central venous catheter through peripheral venous puncture, which mainly provides medium and long-term venous treatment for tumor patients. The training course lasts for 6 weeks. Inserting PICC catheter through peripheral vein puncture is called central venous catheter. Catheter is used to puncture from the peripheral arm vein, and the catheter can directly reach the great blood vessels near the heart.