I'm interested in fat grafting. From everything I have read, it has wonderful benefits. I would like to fill my eye area and fix my jaw line and cheeks. Can this be done in one session? How much time does the procedure take? Where do you harvest the fat cells from? Fat grafting is a wonderful procedure. It can easily be used to fill the jaw line, cheeks and the tear troughs. Usually, this is done in one session. Procedure time varies according to the amount of fat removed, but it can take from one to two hours or even longer. We harvest the fat from the area with the most fat. It can be done from the abdomen or legs. We try not to use some areas, such as the flanks, which may have more fibers but can be used if no other fat is available.