Potential SPOILERS follow.
The Dutch-language interview was translated by a user on Reddit. Here's what Harington had to say:
Kit: The important thing is that I now know exactly how long I am still under contract, and in the meantime-
Interviewer: How many more seasons would that be?
Kit: Nice try (laughs). I can't talk about that. Let's just say that Game of Thrones will remain a part of my life for a while, I'll probably be in my thirties when it's over. One thing's for sure: the day I'm no longer on Thrones is the day I'll bury myself in movie projects (laughs).
For the record, Harington is currently 28 and will be 29 in December, so the comment suggests he's got a least a couple more seasons of Game of Thrones left to film.
The news isn't exactly shocking, as he's already been spotted on the Season 6 set.
Game of Thrones Season 6 will air on HBO in 2016.
(via Watchers on the Wall)