Yeah, ok. I have a peeve with these. Just so’s you know. Why?
Because every time someone mentions one to me, I have flashbacks to that horrifying scene in The Shining (the movie), where Wendy comes down the stairs, sees Jack’s not around, goes to his writing table and thumbs through a box of what she expects is a manuscript for a novel.
It’s pages and pages of the same words, over and over, typed different ways, but always the same words, in the same order. “All work and no play makes Jack a dull boy.”
As Jack asks, “Like it?”
Scariest scene in the entire movie. Aka “Jack doesn’t live here any more.”
I know successful authors who do these as a personal challenge, just to see if they can. After MUCH reworking, something good sometimes falls out of it, but I’ve never heard of anyone doing this sort of megawriting contest and taking their results straight into publication, unless they do self-publishing. They do not, in any case, submit the raw manuscript they started with.
The average publisher doesn’t care if you got the word count before the deadline. They will ALWAYS favor quality over quantity.
If you want to challenge yourself by trying one of these, that’s awesome. I’m sincere about that. I could never try one of these things because my brain simply does not work that way. If you have the focus, intent, and speed, chances are you’ll meet your goal.
Just please do not consider your completion of that goal an automatic step to publication.