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The actor, who plays the title character in the magical franchise, told MTV News that it is "odd" that other stars in the movie are beginning to wrap up filming for the final instalment.
"We've had a few people finish off their stories in the film, and they've been going home, so that is odd," he explained.
"I did have a moment the other day, in the make-up room that I have been in for ten years now. I did walk in and go, 'Wow, this is [hitting me]. One day - in about four or five months from now - I'm gonna walk in here for the last time'.
"Especially because after we leave they're redoing the entire studio, tearing down and starting again."
Harry Potter And The Deathly Hallows: Part 1 will arrive in cinemas this November.
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