Emiri Kato doesn't just play Final Fantasy XI, she lives there.
The voice actress has an impressive resume of anime and game titles she's worked on, but that's nothing compared to her FFXI playtime.
As pointed out on website 4Gamer, Kato has played FFXI for 557 days and 18 hours. That's 13,386 hours.
Before you say, wow, that's a lot, remember, this is a MMORPG. It's not a game. It's a lifestyle.