Best guessing based on the manga and how they've been structuring the show, I'd say they could do 18 episodes. I doubt there is enough material in the two volumes for more than that, and I don't know how much is done on any later material since the second volume came out just a month or two before the anime started.
Judging by the stucture, they might have only 13 episodes, but if I'm reading the manga breaks verse episodes correctly, a fitting ending would be around a 14th or 15th episode...assuming they don't skip anything (though some of it might be repeatitive from earlier episodes). The remaining material in volume two could be left for a second season when they actually have enough material for a volume 3 (which I can guess would be the ending).
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