Writing challenge from Incarnations of Immortality

I've been re-reading a book series, Incarnations of Immortality by Piers Anthony. I discovered this series about a decade and a half ago, while on a vacation in Florida with my parents.

On that trip I also recieved inspiration for the concept and words for a song I wrote called Magician's Plea, but that's another story.

Each of the books that make up the Incarnations of Immortality series contains an extensive Author's Note at the end of the novel. In the Author's Note of one of the books that I re-read recently, Piers Anthony discusses his writing schedule. I am, of course, interested in learning how other authors practice their craft. In this particular Note (Book Four, Wielding a Red Sword), Piers Anthony writes An average of two thousand words a day for two months covers a one hundred twenty thousand word novel. Wow, two thousand words a day for sixty days? That sounds like a lot.

Through a bit of experimentation, I have found that it takes me about ninety minutes to two hours to write two thousand words. Writing two thousand words is not the challenge for me; making up two thousand words worth of story at a time - now that is a challenge.