I have an alcohol problem, and when I drink, I usually have about 20-24 beers during the day... You can calculate how much pure ethanol that is. 1.5 liters of 10% alcohol would get me drunk, but I would need a bit more than that to be satisfied. It seems that you are new to drinking, right? When I drank alcohol for the first time when I was 17, I got heavily drunk from as little as 12 beers, and got a severe hangover after that. Now (I'm 28 years old) I have much more tolerance to alcohol, and can easily take 12 beers during the night and go to work the next day.