Longest stories; nothing over 100k words, but some of them are part of a series.
me_ya_ri mostly writes Smallville, but crosses over into main DCU; she's also at meyari. Lots of AU slavefic; lots of stuff posted at her journal in pieces and eventually uploaded to AO3. (She's one of the few I don't mind reading piecemeal because she updates often and they do work as stand-alone pieces.)
htbthomas; extensive Superman Returns collection. (One long SR series.)
I haven't read the highest word-count stories about Nolanverse Batman; I think I've been saving the Batman/Joker fic for when I have time to focus on it.
If you don't care about smut, you can check out DC2, an fan community that posts comic-book-esque stories of a large set of DCU titles. Some of their works are at feedbooks. (I tend to download them as custom-sized PDFs to fit the ebook reader, and then combine 10 or so of those into a single document. Let me know if you're interested; I've got several titles collected.)
no subject
World's Finest archive, Batman/Superman; requires registration for "adult" rated stuff. Also tied to
Longest stories; nothing over 100k words, but some of them are part of a series.
I haven't read the highest word-count stories about Nolanverse Batman; I think I've been saving the Batman/Joker fic for when I have time to focus on it.
If you don't care about smut, you can check out DC2, an fan community that posts comic-book-esque stories of a large set of DCU titles. Some of their works are at feedbooks. (I tend to download them as custom-sized PDFs to fit the ebook reader, and then combine 10 or so of those into a single document. Let me know if you're interested; I've got several titles collected.)