Game of Thrones spent 3 to 4 weeks filming Hardhome battle

[TMC]

http://www.ew.com/article/2015/05/31...rones-hardhome

"We shot less than a minute a day!" says Kit Harrington, who considers last night's battle to be twice as hard as The Battle of Castle Black. "It's so CGI-heavy it's unlike anything I've ever done on Thrones," he says, pointing out that for "every fight I would shoot three times." The battle required 400 extras and 50 stuntmen. "It was exhausting," adds Harrington.