That's not true. It leaves your system at one unit per hour. But one pint of beer has 2 units or a large glass of wine has 3. So if you have more than one drink an hour you'll get progressively drunker. I used to drink 50-70 UK units a day (5-7 bottles of wine) so it lasted permanently for me. Actually, I sometimes went to hospital for withdrawal and blew like 2.8 on the breathalyzer :/ because FOR MY BODY that wasn't enough to stay well. So it would have taken 2+ full days for me to have no more alcohol in my system.