The time of the cosmetic surgery varies between 30 mins and 3 hours depending on the areas that we treat and the volume. For example, a simple fat transfer in the face to augment the cheeks could take 30 to 45 mins while a fat transfer to the breast can take 90 minutes. There are different types of cannulas used to extract the fat and to inject it again depending on the area that we treat. For example in the face we use very fine cannulas and in the breast ever so slightly larger. The fat cells that are injected are free grafts which means tht they will rely on the blood supply and the nutrients from the recipient area to survive. The amount of fat cells that survive varies from 6o to 90% and therein lies the unpredictability of this operation. With new techniques and evolution of old ones it has become more predictable and will continue to evolve.