How long do I have to wait to get a revision on facial fat transfer?

Generally speaking most plastic surgeons, ask patients to wait six months before doing revision surgery. Often waiting longer is in everybody’s benefit.
Adding context to your question, would help give a more useful answer.
I generally steer people away from facial fat transfer, because the procedure is inherently extremely difficult with the long steep learning curve. Facial fat transfer is inherently, unpredictable and precise, and can be unforgiving. Using fillers on the other hand is quite the opposite. Fillers are precise, predictable, and forgiving if patients don’t like the outcome.
Removing a previously grafted fat in the face can be challenging and difficult.
Best,
Mats Hagstrom, MD