I lived in a 3 bedroom apartment. For our biggest party, we went through 3 half barrels and a party ball. We could have got more, but the liquor stores closed at 2am. The neighbors across the driveway had a keg in their apartment, but they wouldn't tap it until they got home from the bars, which is 2am. Once we had a homeless guy on a bicycle come to one of our parties. He stayed for 4 days.