Fat transfer through surgery is supposed to last the rest of the persons life.
As long as that fat transfer was done properly and your body accepts it's own fat from one part of your body to your other part of your body then the fat transfer is supposed to last a lifetime or forever.
There have been some fat transfers that didn't take though and then the fat cells died off.
So in that case the person had to have another fat transfer done.
But for the most part nearly 95 percent of fat transfers go through just fine and last the rest of the persons life.
There are some risks with fat transfer surgery but it's pretty safe.
Fat transfer surgery costs on average of $3,000.00 to $8,000.00 depending on how much fat is being transferred and where the fat is being transferred.
Since this is not a medical necessity you'll need to pay out of pocket for fat transfer surgery as no health insurance would pay for fat transfer surgery.