Moving fat from one area of the body to another has been used for decades with much success, but often great variability is seen from one surgeon to another. Various techniques have been used (i.e. fresh fat technique versus frozen), both with good results. With the recent addition of good sub-dermal fillers, fat transfers are less commonly used.
In a recent study, the final result took an average of 2.2 years after treatment. That is surprisingly long time.