Game of Thrones showrunners

The showrunners David Benioff and D.B. Weiss said the production of the show is a massive undertaking. The production lasts the entire year and they shoot the show like a 10-hour movie. Season 5 alone was shot in 5 countries, on 151 sets, for 240 days, having 166 cast members, over 1,000 crew members and over 5,000 extras.