He didn't start at 0% BAC, otherwise he would likely be experiencing delirium tremens. Alcoholics tend to maintain a high BAC all the time, enough so that even

He didn't start at 0% BAC, otherwise he would likely be experiencing delirium tremens. Alcoholics tend to maintain a high BAC all the time, enough so that even after sleeping they still have enough alcohol in their blood to avoid delirium tremens. So he probably drank much less than two hard liquor bottles.