It's definitely possfible. 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 when it got long enough 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. Who knows maybe I had a growth spurt back then, but it still grows pretty fast now.