"Winter Is Coming" for "Game of Thrones," sooner than expected. A new report indicates that there are roughly 13 hours left in the series after Season 6, and that the final two seasons of the series will consist of seven (for Season 7) and six (for Season 8) episodes.

"We’ve known for several years now how many hours roughly we want it to go," co-creator David Benioff told Entertainment Weekly, referring to his and fellow co-creator D.B. Weiss' 73-hour target for the series. "We wanted to end while we’re still ambulatory and going strong. We love the show too much."

However, HBO's entertainment president Michael Lombardo says that the number hasn't been confirmed, and is merely an idea the showrunners have: "In every conversation, that’s been [the showrunners’] thinking. It will be interesting to see how strongly they feel about being definitive about that when we are in a position to announce seasons 7 and 8."

Lombardo also said in a statement released by HBO, "Any conversations about the end of 'Game of Thrones' and the number of episodes of future seasons is purely speculative. As is customary, HBO will sit with Dan and David to discuss the details once a decision has been made to go forward with season 7."

He added, "[Ending 'Game of Thrones'] will be a tough one for me – partly as an executive and partly as a fan. A show that resonates this way and works on all levels, it’s painful to imagine it ending. At the same time, David and Dan have a big responsibility and I respect that enormously. If we just keep going then we’re doing what the [broadcast] networks have done – and nobody wants to do that."

"Game of Thrones" Season 6 starts April 24 on HBO.