It really depends but generally speaking just because of the mechanics of it voice-over is easier because there is no hair no makeup no wardrobe no fittings no line memorizing. You don't have to me woken up in Russia at 6 in the morning and go film a scene. It's just easier on the body the family life to do voice-overs.
It's not like I just have to go to Washington and go to the White House everyday and go to the same press conference at 10 in the morning and then be briefed at 4 in the afternoon and then get a story on at 6.
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I don't know any other lifestyle. I get up in the morning and I really do feel that the world is my oyster and I start that way the same as I would if I were preparing to write a song: put a blank piece of paper up on the piano and you go for it.