A gynecomastia surgery lasts for a duration of one to two hours depending on the complexity of the case, the amount of tissue that needs excising, and the amount of fat to be suctioned. Concerning the results of the surgery, it is permanent because the eliminated tissue cannot come back on its own. However, gynecomastia and pseudogynecomastia have a possibility of recurring if you do not change your lifestyle and if you are not adequately monitoring your weight.