From Brotzu interview:
https://bellicapelliforum.com/en/interview/exclusive-interview-with-dr-brotzu-for-bellicapelli/
Hair growth is witnessed and also
miniaturized hair or
even vellus gain their normal appearance again.
________________________________________
Vellus hairs are practically
invisible and found on
slick bald areas,
miniaturized hair are what we call
peach fuzz.
Also, Brotzu said
at least 5 years of regrowth if I recall correctly. Basically, it will depend on the subject, you could get a few months, 2,5 or 7 years.
Keep in mind that nothing is confirmed, this is the best case scenario if we trust Brotzu's words.