User blog comment:Omega natsu2/Anime./@comment-4829046-20140330124301/@comment-24034641-20140401075458

I really do hope that they're not doing so many in 12 episodes, like 2 novels in one season would be good, 6 episodes per novel, at about 2 hours all up for both novels which is good...

ALSO about the Log Horizon, that was done well novel->anime wise and it's easier that way due to how small yet detailed the novels are, so they could do 3-4 eps per novel, and it'd work. Hopefully that's what really happens with BB unless it's been 100% confirmed to be 4 novels in 12 eps, 'cos that means 3 eps per novel and with their size, that won't really work.