Waiting Time Between Endoscopic Brow Lift and Hair Transplant?

Hi there Dr’s. I am planning on having forehead bone/contouring surgery through an endoscopic approach. This will include having a brow lift due to the potentiol for loose skin. I have a high forehead 6.5 cm but I do not wish to do a hairline lowering/scalp advancement procedure within this due to scarring. i also do not think the results ever look that natural therefore I would like to get hair transplants done after it. What is the minimum time i can wait before having the transplant ??