It was 18 months
First 500 grafts were taken from the denser parts.
Then 600 from nape and 50 BHT was implanted on the gaps
Then 1.100 BHT more was implanted on the rest of the gaps once we confirmed growth.
I still have 300-500 more to close in more gaps but I don't need them so I'll call it a day and move on!