There are approximately 3 chapters in every episode. I think the fillers will end at the end of this month, but I dont know what the episode in October is (it could be B and A's backstory, but if it isnt we'll have another month of filler). After the fillers end, we have 7 episodes give or take before Madara is brought into the anime, and about 22 episodes until the anime is caught up with the manga, but again those are only the canon numbers, the filler will add on to those numbers.