I have no idea myself. The magazine in question is Dengeki Daioh. It formerly ran in the now discontinued Dengeki Comic Gao, and both are/were monthly magazines. The fact that less than 24 chapters have been published in over 2 years must mean that it's published a chapter a month on an irregular schedule.
As for the final episode, I've already seen it twice myself. Once on Sci-Fi and once on DVD. I have no intentions of watching Sci-Fi's chopped up version again, plus it hasn't aired here yet tonight anyway.