But just how long will the episode be? According to Winter Is Coming, episode 10 is going to be 69 minutes long. In other words, it’s going to be the longest Game of Thrones episode in the series’ history. Just to put this in perspective, the run times of the other episodes this season were 54 minutes, 53 minutes, 59 minutes, 57, 52, 51, 59, and 60. Before tonight’s episode, the longest episode was the Season 4 finale, called “The Children,” which had a 66-minute air time.