Board Thread:Questions and Answers/@comment-80.132.99.68-20150329114408/@comment-26580819-20150829125811

My guess is that it varies.

Here is the web novel: http://ncode.syosetu.com/n8725k/

It has the dates it was posted (I think that's what the dates are anyway). The dates are all over the place, from being all within the same month for some volumes to spanning over years (for vol. 6 which started in Dec. 2011 and the last chapter is dated March 2013. (I run it through google translate so it's easier to figure out, but the translation sucks and it's hard to understand the actual story though).

Volume 10 material was started in January and it's due to be released Sept. 30th.

If you look at the light novel section of this wiki, you can see the the publication of the Japanese volumes is kind of sporadic. http://log-horizon.wikia.com/wiki/Log_Horizon_(Novels)

So yeah, my guess is that it's impossible to guess. Only two sections have been posted so far for 11 (there seems to be 9-10 sections per volume) so it'll probalby be awhile. If I had to guess, I'd say that it would probably be at least 6 months before there's a published vol. 11. (though part of that is based on vol. 9 came out in March and vol. 10 comes out next month, but who knows, it could be year or two until 11...though I hope not).