For me the biggest problem was the donor site - my doc shaved around it, so after the HT I had a large arc of very shaved hair even after he had closed the wound up. For 2 weeks I wore a cap, then I got a haircut at the back which exposed it even more but at least evened it up so it all the hair would grow in at a similar length. For a week and a half I wore concealer at the back over the shaved bit, but now, four and a half weeks in, everything looks normal and I don't have to do anything to it.
So I would say - by week two, when I'd had a haircut and could wear concealer, no one could tell I'd had anything done.
For me the biggest problem was the donor site - my doc shaved around it, so after the HT I had a large arc of very shaved hair even after he had closed the wound up. For 2 weeks I wore a cap, then I got a haircut at the back which exposed it even more but at least evened it up so it all the hair would grow in at a similar length. For a week and a half I wore concealer at the back over the shaved bit, but now, four and a half weeks in, everything looks normal and I don't have to do anything to it. So I would say - by week two, when I'd had a haircut and could wear concealer, no one could tell I'd had anything done.