I would have thought more than that? There were ten for the last BB two years ago, and half a dozen by Elspeth and Seachai, and Mucca and Tsukinofaerii and I have all done big bangs since then, and going back further there's Kijikun's fic and the Moth fic.

You did see the last BB, right? Some of them were never posted to the main comm.

:D I'm doing SFF Big Bang as well! And AU Big Bang! Three in one year is totally doable. AU is only 15k, that's nothing.