Recovery time
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Dr John Mundy is an expert in blood/alcohol analysis at the Forensic Science Laboratory in London: "Calculations are always based on 100 millilitres of blood and it does not, therefore, matter how big or how small the person is. "The rate at which alcoholis lost from the blood is between 10mg and 25mg of alcohol per 100 ml of blood every hour with the most likely figure being 15mg. It is quite slow when you look at the levels one might get to." While it is not possible to generalise it is not uncommon for someone who has gone on a real "bender" to end up with a blood/alcohol concentration of about 250 or more milligrams of alcohol per 100 millilitres of blood. In such a case it would take, on average, about 11.5 hours to bring the concentration down to below the legal driving limit.