How Long Will Marvel : Ultimate Alliance Last Me ?

I was just wondering whether to get it or not , yet my main worry is how long it will last me ?

Also , i always try to get a full 1000 Gamerpoints for a game aswell

Thanks ! :D

Even if you only play through it once you should get a solid 20 hours out of it.  But I found it impossible to only play through once because the characters I used on my first playthrough were not close to being maxed out so I played through again.  Then there were so many more characters that I wanted to play through it with that I am on a 3rd runthrough.

This one could last you a long while if you like the game.

get the hero/vilian combo pack for 800 points.  it adds 250 achievment points.  plus u get Venom, Magneto, Sabertooth, Doom, Cyclops, Hawkeye, Hulk and Nightcrawler. 

Has very good replay to it.  If you go to Gamestop buy it used and get 1600 point card.