I did NaNoWriMo for the first time last November. I came up with about 37K words.
By the end of December I had 44K, finishing the story line.
Then started my “quick revision mode,” which means slashing and burning all irrelevant stuff, and building bridges to make a story arch.
The first week of January, I was left with 3K. Yep. That would be three thousand words, down more than 10,000. Permission to write dreck during NaNoWriMo left me with a skeleton at the rewrite stage, but a very nice skeleton.
Now, mid-February, I am up to 23K with three chapters to revise/rewrite.
Seems like my MG novel will be short even for a MG. When I’m “done,” after I sit on it for a while, I’ll get back to it again for some more rewrites and revisions. I hope to have this baby ready to be submitted by spring. That would be the shortest amount of time I ever spent on a book — not by hours, of course, but by days. Because I’m not working full time, I can spend a lot more time writing instead of spreading it out over years. Pretty cool.