So what's your ideal length for a $60 "triple a" retail game?

[Barozi]

As long as there's a good amount of replay value, I don't care too much about the lenght of a game.

If it was, say 6 hours and then nothing left to do, then it wouldn't be worth my $60. (let alone 60 or 70€)

If I get 10 hours out of it, I'm fine.