The Urantia Book is 2,097 pages long and could be considered a religious text. I can't find it in this article.

Can't put this on the page 'cos it'd be natter:

The Codex Giygas. Are you a bad enough dude to grasp its true form?

Would it be a good idea to separate out the in-story examples from the actual works? I'd do it, but I don't want to make more work for someone else if it's a bad idea.

Couldn't decide where to put this on the main page, so I'm putting it here: the Longest Stories C2 has identified 52 stories on FanFiction.Net with more than 1,000,000 words. Of those, 7 have over 2,000,000, and one, The Subspace Emissary's Worlds Conquest, has broken 3,000,000. (Major thanks to ncfan for her help!)