Thats impossible.I'm serious.You'd have to beat each boss in like 15 seconds.The sniper battle with The End takes like 5-10 if your good at it.The Boss' fight takes 5-10 minutes because shes fast and has a powerful gun.And it takes about 5 minutes for a chance to escape from the prison and then another 5 to get out.Its impossible.That is unless you just ran through the game blasting people to bits w/o using stealth.I'd say the fastest a person could beat it would be an hour but they'd have to be good and probably use no stealth.Then again if you had stealth camo you might make it unseen in an hour.
"Fighting was the only thing I was good at but at least I always fought for what I beleved in."