The Jon Snow actor and his co-stars recently went back to work filming the climax of the Song of Ice and Fire saga as part of a massive production schedule that's tipped to stretch well into next year.
Harington has been at the center of several of the show's most memorable spectacles - Hardhome, the Battle of the Bastards and last season's skirmish with the Night King, to name a few - but even he has been blown away by the scale of the final episodes.
"I'm actually down in York, I'm back in Belfast [where the show is filmed] some next week," he revealed to Time. "It's a lot of - it's just bigger than it's ever been! It is sinking in, it's just quite emotional."
Acknowledging the approaching end of Game of Thrones, he admitted: "I don't know how I'm going to feel sometime next year when I've finished. It's quite a sudden shift, I guess, but it feels like the right time."
The immense scale of these six episodes would explain why HBO and producers David Benioff and D. B. Weiss have chosen to delay transmission until 2019.
The cast recently received the final script, with Sansa Stark actress Sophie Turner revealing that she'd had a deeply emotional reaction to learning what Benioff and Weiss have planned.
"It was very, very bittersweet," the actress told The Hollywood Reporter. "The first day of the actors coming in and that kind of production starting, the day where we had the final read through for the final script... it was really bittersweet. It was hard.
"At the end of the very last script, they read aloud, 'End of Game of Thrones.' As soon as they read that out, pretty much everyone burst into tears.
"There was a standing ovation for [showrunners David Benioff and Dan Weiss]. We were all clapping and cheering. It was amazing."
Game of Thrones airs on HBO in the US and Sky Atlantic in the UK.
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