There are two types of time required for liver cancer patients to have an intervention, one is the procedure time required for liver cancer intervention and the other is the time interval required for an intervention. The procedure time required for liver cancer intervention can be completed in 0.5-1 hour if the liver cancer is not very serious. The procedure of intervention is to puncture the femoral artery and deliver the catheter to the arterial blood supply of liver cancer for embolization, so as to control the blood supply of the tumor and make the tumor ischemic and necrotic, and if necessary, to add chemotherapy drugs for local chemotherapy to enhance the control effect of liver cancer. The specific operation time varies from patient to patient. For some patients, due to the large size of the tumor or more blood supply to the tumor, the operation time may be extended due to the need for blockage control from multiple directions. In addition, individual anatomical variability and the operator’s proficiency are also important factors affecting the length of interventional procedures, so the specific situation should be analyzed. How long does it take to do an intervention? Regarding how often to do an intervention, it depends on the effect of the intervention. 3-4 weeks after the intervention, you can further check the CT or MRI scan plus enhancement to determine the effect of the intervention. If the tumor has reached complete ischemia and necrosis, there is no need to try interventional treatment anymore, and regular review and follow up is sufficient. If the tumor still has blood supply and activity, another intervention may be needed to consolidate the effect of the last intervention. In this case, it depends on the specific situation of the tumor, and even in some cases, multiple interventions are needed to effectively control the tumor. It is also possible to consider combining other treatment options to control the tumor, including radiotherapy, ionization, targeted, immunotherapy and other treatment options after the intervention is not effective. The exact frequency of intervention should be determined based on the review.