When a small amount of fluid is present in a patient with pneumonia, the recovery time needs to be determined based on a combination of factors such as the clinical diagnosis, the severity of the clinical symptoms, and the timeliness of the treatment. A small amount of pleural effusion in pneumonia will normally take 1~2 weeks to recover after active treatment. 1. If a small amount of pleural effusion is caused by lobar pneumonia, after standardized anti-infective and symptomatic treatment, the inflammation in the lungs will gradually improve in about 1~2 weeks, and most of the pleural effusion can be completely absorbed. 2. If the pleural effusion produces a large amount of fluid, which will affect breathing, it is necessary to evacuate the fluid through thoracocentesis, and at the same time carry on the anti-infection treatment before the symptoms can be improved and promote the recovery of the disease. When pleural effusion is found, it is necessary to consult a regular hospital in time, cooperate with the doctor to improve the examination and standardize the treatment.