The play time for this game, as stated by the publisher is 240 minutes. If we assume that's for a 5 player game, that comes out to 48 minutes per player. I just picked up a copy of this at my local con and played it with three of my kids for the first time this week. We didn't finish because it was getting way past their bedtime. But it didn't seem like it was going to take the full 192 minutes (48*4). And that was for a learning game, with Dad constantly referring to the rulebook for clarifications. So I'm thinking WotC was erring on the side of caution when listing the play time at 240 minutes.
But I'd like to hear some thoughts from experienced players. How long do your games usually last? Here's a poll, for posterity's sake: