What is infinity mode in dead rising

You can't save, your health drops down every 1 minute and 40 seconds, every single survivor tries to kill you, the helicopter never arrives, it's really hard to survive, there is no food dispensers (places where you can take an infinite amount of food) its pretty hard it takes 7 in game days (About 14 hours in real life) only way you can finish it have like 5 fans on the xbox have a cooling device and take turns over night with your friends to finish oh and level 50 so you can carry tons of food so you don't die Good Luck! Note:If you ever finish it call The Guiness World Records because no one ever finished it!