How long does the surgery for sliding genioplasty last?

It appears from your photos that orthognathic surgery would provide a more balanced face. See Dr. Barry Eppley  for a consultation. Good luck

It is not necessary to remove screws and/or plates after sliding genioplasty except if they are palpable or create discomfort and tissue damage (loose screw, mobile plate). If you insist on removing hardware it can be safely done after one year; have in mind that it can be more extensive p...

There is no need to remove the hardware (plates and screws) after facial reconstruction (genioplasty). The plates are only 1.5 mm thick and the screws are 5 to 7 mm. None of which should be palpable. 

It is difficult to provide advise without profile photos as well as the details of the ages of the photos that were provided. Some of the photos appear to be from several years ago. I would not say that you have a witches chin deformity. The area slightly lateral to your chin is slightly...

Interesting question. There’s no way to lower your eyes as you have in the morph, but I’d suggest trying a bit of temporary (and reversible) filler like Voluma or Juvederm Ultra Plus in your cheeks. That way you could make your face appear less long and more heart-shaped. This is often the first...