There is really no set time to how long it takes. I've seen games zoom pass that process with ease. At other times a game sits in Apple limbo for what seems like forever. We could be seeing this game as early tonight, who knows.
That's what I'm thinking, 4 days seems to be sort of the "max" for apps to stay in review, and they're usually through quicker than that. Either that or it was rejected.
This game is NOW OUT! iTunes Link: http://itunes.apple.com/us/app/death-worm/id396669943?mt=8 TA Thread: http://forums.toucharcade.com/showthread.php?t=72264