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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.
Therefore, now you can roughly guess the answer to the query regarding how long does alcohol stay in system. This 10 ml of pure alcohol roughly approximates to around one unit of alcohol. For 1 pint of lager OR 1 glass of wine, which is about 2.5 units of alcohol, it would take 2.5+1= 3.5 hours to eliminate the alcohol.