My girlfriend called and said her neighbor was dropping by with half a keg of beer that he didn't finish from last night. I'm not one to turn down free beer so I agreed. It's a keg that has been tapped for about 16 hours with a hand pump tap. What's the shelf life on this thing before it turns in to cardboard? 24-48 hours? I guess it's time to call up my friends and tell them to head over ASAP.