If the general 2 Manga Chapters to 1 TV episode applies, this would mean an arc of over 50 episodes. That's quite an arc, and I think I heard Terra saying that the next arc is the best in Naruto so far. That will be interesting to see.Originally posted by: Noonan
not without giving spoilers.
P.s. After this storyline the Anime should be on the same storyarc as the manga which so far is covering over 100 chapters.