This is a slow process. So, the alcohol in one pint of ordinary strength lager will take two hours to pass out of your body. If you drink a lot in the evening you may still be over the limit in the morning. And, drinks at lunchtime could have a top-up effect, and again, could make you over the limit. The graph will vary for individuals of different sex and weight.
Body processes one unit per hour.
The upper limit for 'low risk drinking' recommended by UK medical bodies is up to three units per day for men, and up to two units per day for women. Women have a lower limit than men mainly because women's bodies tend to be smaller, and have more fat and less water. This means that the alcohol is less diluted and stays in the body for longer. Drinking levels and driving The UK driving limit is 80mg of alcohol per 100ml of blood - which is roughly equivalent to two pints of regular strength lager. This is however, only a guide.