game development usually takes anywhere between 2 to 4 years for a game. we announced our game in 2006 at comic-con, and we've announced we are done before 2008's comic-con. that's right on target as development schedules go, and we did it with far less people!
but nobody really knows that, as i wouldn't expect anyone to, so that's why i am saying. :)
i think our biggest mistake is that we didn't tell anyone we had a long way to go when we showed it. it appeared almost done, but it wasn't. in reality it was only 2 months in!