Hlaf an hour queue to get into a server but its worth it. The constant carnage and the great upgrades kept me going for hours. It also helps if you happen upon a great team which I did though we lost some waves but we pushed through switching classes and doing different upgrades until we hit a hot streak and we just kept on winning til the end. And you really do need six people to play or have really really good teammates otherwise you've already lost before the fight even begins. Three of the achievements will take a looonnng time to get. They are the one million in cash collected, a hundred thousand boots killed and then a million bots killed.