Everyone grows at a different rate. Scar tissue undoubtedly will delay your growth. I had a Ht into scar tissue and really noticed growth at around the 18 month mark (not the signs of growth, but the signs of a change in appearance, i.e., more hair.)
By my estimation, it didnt even start growing until the 12-14 month mark then. Since it was a small session spread out through native hair, it was not as obvious. So you, no doubt, have to be more patient than someone who has never had any work done.
Strangely, a recent session of mine was 6 months ago, and it was into "virgin" territory in an attempt to repair my hairline (so far, so great) and it grew faster than any HT I can ever remember having. But the "virgin territory" is gone now, so all future repair for moi will come with the caveat it show results till around the 12-18 month mark.
Waiting sucks! Thats why my last session rocked.