Generally speaking, the recovery time after surgery for a comminuted fracture of the humerus is about three months, but this can vary from person to person. If the patient is young, the healing of the fracture ends might be quicker, potentially achieving bony union within two to three months. However, if the patient is elderly, their healing might be slower, possibly requiring three to four months to achieve bony union. Therefore, it is necessary for patients with fractures to regularly take X-rays to observe whether the fracture ends have achieved bony union. Typically, they should visit the hospital to get an X-ray about every two weeks to check on the growth of the fracture ends.