"Game of Thrones" author George R.R. Martin tells New York Magazine’s Vulture blog that the biggest challenges in doing television are budgets and shooting time.

The writer noted that his HBO adaptation has been given fewer hours than other shows on the pay-TV network, the story reports.

"We had 10 hours for the first season, and the same for the second. ‘Boardwalk Empire’ has 12, ‘Treme’ has 12 — if we’d had two more hours we could have told a lot more of the story," Martin says.

His series’ third novel, "Storm of Swords," "is enormous and it will have to be broken up into two seasons, I think," Martin adds.

He noted that he’s also concerned with "the butterfly effect," referring to the Ray Bradbury short story about a time traveler who kills a butterfly during a visit to view dinosaurs, causing the future to change.

"On TV, we saw the death of Mago, but we will see him in the books — he’s still alive. It will have to be different in the book than in the show, because they killed him on TV. These are the kind of ripple effects that can happen," Martin notes.