I've got the chat transcript from last year's, which was 2 hours. They used to go about 3 hours, but that was when we had a few more categories. It can vary depending on how fast the presenters and winners go.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited