Maxilla Fracture Healing Time?

You have asked a very good question. It sounds like you have been waiting as the doctor has instructed but are still concerned about the changes you have experienced. Typically fractures take between 8-12 weeks to fully heal. Swelling can take longer to go away but can be persistent for long periods of time if the areas are left to remain swollen. This is why it is important to keep the area elevated by sleeping with your head up and avoid that side to be facing down. 
If you have met with your doctor again and have not had all your questions satisfactorily answered, then try meeting with another surgeon who specializes in maxillofacial surgery or craniofacial plastic surgery. It never hurts to get a second opinion because they can explain things differently that you may get more information about what is going on with the changes in your face that you see. It also helps to get reassurance that you are doing everything satisfactory to help with the healing. 
Best wishes
Eric Payne, M.D. 

The body takes time to heal. I tell patient's scars continue to change and mature over 9-12 months, however swelling should be resolved in 6 months. You did not post a picture, but how much difference is there truly? You have suffered a broken bone, even if you had undergone surgery there is no guarantee there would not have been a difference. Wait the 6 months and if it still concerns you talk about it with your doctor.