It seems Halo 3 campaign is quite a bit longer than initially reported...

[Dolla Dolla]

I got a chance to get my hands on Halo 3 over the weekend, my brother came to visit. We played a bit of co-op, and then I played some single player by myself ... on Heroic.

Those bastard alien snipers were annihilating me left and right.

I'm guessing that those who are big into Halo can probably run through it in under 10 hours, but the average player will take longer, especially if they play on a harder difficulty.