How much length to expect from transplants?

[Wymee]

Hello - I'm menopausal, almost 56 and have been on HRT for hair thinning in a pattern that I've been told by a hair transplant doctor makes me a good female transplant candidate: Thinning is at hairline and temples, with none at crown, vortex or in back. It's quite thick where it isn't thinning but the part that frames the face -- the most important part to women -- won't grow very long and looks quite peculiar. The HRT has lessened the loss but I'm not sure I want to stay on it and I was thinking of taking the transplant route. My question is how long can I expect hair transplanted at the hairline to grow? Is there a limit to length with transplanted hair? Also, I've been told that implants at the hairline in women can be traumatic to the scalp and that there is the possibility that not only will the transplants not "take" but other hair in that area will be permanently lost. How serious of a threat is this?
Thank you for your expertise.