It's definitely possible. I had breakage last year in the nape, and it went from that length to apl in around four months, which I did not think was a big deal until you just pointed this out. Believe me I had about 1/2 an inch in those areas, and still don't know how I did it. I had breakage from a protein pack (hard protein my hair does not like) and that was the main area affected. I didn't have a relaxer or anything. That was the culprit. Anyways, I was eating right, exercising and using my nettle tea rinse at the time. I did combine that with keeping that area braided up and moist. I'm still cutting to catch up my hair but it is still growing like the dickens. I didn't produce pics because I never thought this would come up until I read this thread. Sorry.
However:
It seems to go along w/ what they are saying in their comments section with the whole s curl thing. I sprayed braid spray back there like there was NO tomorrow. I wonder if there's something to s curl and braid spray like products....
Me: exercise, eat organic, eat TONS of fish (like one meal a day has seafood at least), veggies, and some chicken. CHLORELLA and nettle tea rinse. That's all I got for ya. IDK how much or fast my hair grows because I'm natural and I just eyeball it, but it grows SUPER fast now, and used to grow really slow.