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Adding up your units. If you drink a large (250ml) glass of wine, your body takes about three hours to break down the alcohol. If you drink one pint of beer, your body takes about two hours to break it down. One pint of strong lager is equivalent to three units, so this will take longer.
How long after 12 beers can you pass a breathalyzer? From the original question posed, we will assume you drank 12 beers. It would be dangerous and difficult to consume 12 beers in one hour. 12 beers in one hour could result in death; or just a trip to the emergency room if you are lucky.