Every honest fat-transfer conversation includes the survival number. Here's how it applies specifically to hip dips.
Across body fat grafting, roughly 50–70% of transferred fat gains a blood supply and survives long-term; the rest is resorbed in the early months. Plans account for this with deliberate, modest over-correction — which is why you look fuller at week two than at month four, by design.
The dip zone offers reasonably vascular subcutaneous planes and — crucially — modest volume requirements. Grafting 150–400 cc per side into receptive tissue is a friendlier survival proposition than forcing large volumes anywhere; the micro-droplet, multi-pass technique spreads every cc across well-perfused planes rather than pooling it.
Three to six months: swelling gone, survival settled, the contour that remains is living tissue and stays. Judged earlier, you're judging swelling; judged then, you're judging the result — and that's when any top-up is sensibly discussed, not sold upfront.