So, I guess I should mention that I'm doing NaNoWriMo this year! Not actual NaNoWriMo, but I am pursuing a personal writing goal.
I've done actual NaNoWriMo twice (2011 and 2012), both times while I was in college. These two comprise the entirety of what I have written on Emberfell, covering the beginning of the story until the beginning of the last chapter (which I imagine will be rather long, once I actually write it). I succeeded both times, forming the single largest written work I've made so far.
In 2015 I did a personal NaNoWriMo which consisted of me writing on Those Who Touch the Fire (still called Embla at the time). This goal was to work on the story until it hit 50,000 words, which meant writing 20,000 or 30,000 (I don't remember which).
2015's NaNoWriMo was spread throughout the whole story, and I just wrote wherever I felt like writing. Since then, I've gone back to the beginning of the story, editing already-written portions and filling the gaps between them. This year's NaNoWriMo, I'm continuing this wit ha goal of 500 words per day.
This story was originally meant to be a novella, but at the rate it's currently expanding, I expect it to be over 100,000 words by the time I'm finished (it's currently around 70k, though some of that is non-story writings about the plot and setting).
I'm not sure how far I'll get in advancing the plot, but I think I should at least finish "Section 2: Earth," which concern's Embla's journey to the underworld. It's hard to judge this sort of thing, since I'm constantly finding that the gaps I've left myself to fill are much more complex than I initially thought.