Why differing timelines for breast revision?

Hello, I recently had a breast augmentation exchange and when I was asking a few different surgeons about timeframes in between surgeries to have another exchange (larger implant to smaller implant), I have received timeframes ranging from 3 months to 1 year after surgery to be able to have another revision. Why do different surgeons have such drastic timelines? What is the risks of having it done at 3m vs 1y? Thank you