I think after hearing repeatedly that each campaign (co-op and single player) were supposed to be twice the length of portal one I was expecting 8 - 10 hours each. This is a blatant lie (and not in that whole the cake is a lie thing hurp durp) it took me 9 hours to do both, and don't get me wrong the game very fun and enjoyable and I would recommend it. I just though I should let everyone know that it may not be as long as you were expecting it to be. But fuck the whole shop and buying hats shit that ruined TF2 don't let it ruin this game Valve!