To help give an idea of the length of this game, I completed all 1000G in one day. That's about 11 hours of sitting and playing it.
So it's a great game to rent for a day or two for 1000G.
MARVEL SUPER HERO SQUAD: THE INFINITY GAUNTLET 1000/1000G, Jan 16 2013
(puts my gamerscore at 210,650G)