Immunotherapy for lung adenocarcinoma takes about 2~3 years, and the specific time needs to be adjusted appropriately according to the progress of patient’s condition. Lung adenocarcinoma is a disease that cannot be completely cured, and immunotherapy is usually long-lasting. For most of the patients, the disease can be controlled in about 2~3 years, after which the dosage can be gradually reduced or discontinued, or other methods can be used to control the cancer cells, such as taking targeted drugs orally according to the doctor’s prescription. If the efficacy of immunotherapy for lung adenocarcinoma patients is not clear, it may be necessary to increase the course of immunotherapy as well as the related time, and when the tumor is in complete remission, immunotherapy should be continued for another 6 months. When diagnosed with lung adenocarcinoma, patients need to go for regular checkups during the immunotherapy period, and doctors will adjust the medication regimen and the duration of medication according to the patient’s condition, so it is recommended that patients actively cooperate with doctors for treatment.