I could do it. @2,000 words a day, every day, it would take 25 days. But the catch is, you have little time to be sick, get writer's block, or any other delays. And, you would need a really good idea on how the story will go, from beginning to end, before you start.
Each of the NES chapters is longer than 50K words. When I started on each one, I had the goal in mind of how each would end up....It was just a matter of getting there. I added in a whole lot of side stories along the way, to spread out to multiple characters and make it as interesting as I could. Sometimes, the writing has been easy, and flowed swiftly. Other times, it was a slog, and may take hours just to get in 2k words. So, all that has to be factored in to just how long it's gonna take.
I think only self-disciplined people would be able to do such a thing, frankly. And maybe that's what this competition is all about. Anybody can write 50k words of crap, that's done every day. But it takes talent to write a good story that lasts through time.