Hmm... If I'm remembering correctly, this is about the third topic about this. Oh well, anyway... Even the manga is not finished yet, it's already somewhere in chapters 200-220 if I'm remembering correctly. And in anime we are now in the episode 68, which is same as chapter 116 in manga. From that we can say that there will be at least ~70 new episodes coming. Of course that's just how many episodes at least, propably there are even more coming, but we can't be sure about how many, as the manga hasn't been finished yet.