Like 10 chapters till end, but the series will continue in anime form, something like a " Third Part " in Naruto's New Era Opening Project starting with The Last: Naruto the Movie that will be released on December 6 casting the characters as adults
my ocd says 9 so we can end on 700 my realism says one with a cliff hanger that leads into the last ( see my prediction) My guess is 4 if kishi wants to take his time