Preparation of the harvesting site, fat harvesting, rinsing and filtration of the fat to obtain optimal graft size without debris toxic to the fat cells, and finally reinjection of the fat into areas of the face lacking volume. These stages require at least 1 hour of surgery. Most often, these four steps are combined with eyelid surgery: upper and lower eyelid blepharoplasty. This is why the duration of the entire procedure is usually more like 2 hours 30 minutes.