Not that I am an authority on anything, but - the lethal dose of alcohol is clinically defined as the amount that would kill half the population. Most authorities place this dose at about .40%, or about five times the legal limit here in BC. However, there are many cases in which death occurred from alcohol poisoning at much lower, and in some cases, higher levels. For a 120 lb. man or woman drinking very quickly, it would only take about 9-10 drinks in an hour to reach the lethal level.
It's important to note that the body oxidizes about one ounce (approximately one drink) an hour. Depending upon how much you drink, how quickly you drink, and what else is in your stomach, it may take from about 30-90 minutes after you stop drinking before you reach your highest level of intoxication. This occurs whether the individual is conscious or passed out, thus it is critical that someone who is semi-conscious or unconscious be constantly evaluated.