Last year, I thought that I was definitely going to sign up for it and went to the website only to find that I had signed up several years previous and had logged in every year since. Good intentions and all that. Well, it starts today and although I have an idea for a scifi book that would be roughly that length, I haven't plotted it out yet and while I am not a strict plotter, in this case, I think it might be a good idea.
If you are hearing about all this for the first time, then I encourage you to get going. I know from bitter experience that if you fall behind a day, it is ridiculously difficult to catch up. The website is here. Good luck!