That Sedat guy from LiveLifeTaller in Turkey apparently did 3 surgeries in total to become 20 cm taller. However the sad reality is that most people can't take this much height, espicially if you were really short to begin with. Even if someone could and were extremely lucky lengthening more than about 12-14 cm looks stupid because your legs a waaaayyy longer than your torso now. He basically overlengthened got extremely lucky nothing bad happened and now overlengthen every single patient in his clinic without realizing how big of a risk his taking for his patients. Their is a reason that every single very experienced surgeon sticks to 8 MAX on femurs and 5-6 tibias max.