Game of Thrones is "nearly halfway" through its run, showrunner David Benioff has said.
Benioff and co-showrunner Dan Weiss told the Los Angeles Times that while the HBO fantasy drama's total number of seasons is "to be determined", they are keen for the show not to "outstay [its] welcome".
"There is a tendency, I think, if something goes well, you want to stick with it and just keep it going forever and ever," Benioff said.
"As much fun as we're having with this... part of the reason we love this story so much is because it's a single story. This very much has a beginning and an end and we're nearly halfway there."
Weiss added: "The point going into it was that we wanted to start at the beginning and work our way through to the end, work our way through to the point beyond which there was no reason to keep telling the story because it was over.
"How long exactly that's going to take and what form it's going to take is obviously something that needs to be determined as we go."
Game of Thrones producer Frank Vogler has revealed that he expects the show to span seven seasons.
"[The total number of seasons] is being discussed as we speak," Vogler explained at May's BAFTA Television Awards.
"I would hope that, if we all survive, and if the audience stays with us we'll probably get through to seven seasons."
Game of Thrones airs on HBO in the US and on Sky Atlantic in the UK.
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