“I think we’re down to our final 13 episodes after this season,” Benioff told Variety. “We’re heading into the final lap. That’s the guess, though nothing is yet set in stone, but that’s what we’re looking at.”
Variety added, "Sources later clarified those exact numbers were premature, given that the showrunners are now just beginning to outline their plans, but said that any upcoming seasons may be shorter than the full 10 episodes of seasons past."
Game of Thrones will go back into production in July.
Season 6 premiere of Game of Thrones, titled "The Red Woman," will air Sunday, April 24.