The general rule of one hour for every standard unit consumed. (or 1 shot liquor, 4 oz wine, 8 oz beer) may be used, but keep in mind several issues, as listed below.
This is a variable thing. The more alcohol that is consumed, the longer it takes for it to be eliminated from the body. To be on the safe side, 24 hours should elapse (even though several hours is long enough in most instance of light drinking, where one or two drinks are consumed.). It takes longer for women to eliminate alcohol, in general (than men), and 50% of the Asian population (in the world) have very little to no alcohol dehydrogenase enzyme, with which to eliminate alcohol - so this is yet another variable.
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depending on the ponetcy of the alcoholic bevrage and the so called proof the body metabolizes alcohol at at different levels depending on body weigh and tolerance but its said to be 1 drink per hour one beer one hour one shot of spirts one hour and so on.
Unlike other drugs, which show an exponential decrease in blood concentration, alcohol is metabolized at a relatively constant rate. The rate at which alcohol is metabolized depends on many factors, including age, weight, ethnicity, metabolic tolerance and the effects of other drugs and nutrients. About 5% of the alcohol that a person consumes is excreted in the urine; the rest is metabolized by the liver. As a very rough approximation, an adult male can metabolize one ounce (30ml) of 80-proof alcohol per hour. (Based on blood alcohol concentration response curves published in Wilkinson et al., Journal of Pharmacokinetics and Biopharmaceutics 5(3):207-224, 1977. Other sources can be found which cite rates 50% higher and lower than that.)
It depends on specific factors of a person's weight, what they had to eat before and after as well as the quantity and type of alcohol consumed.
About 0.6 oz (the amount in standard drinks of beer, wine and spirits) per hour.
The body can metabolize and otherwise eliminate alcohol at the rate of about .015 of blood alcohol concentration (BAC) per hour. That equals about one standard drink per hour.
The liver metabolizes alcohol at a rate of approximately 0.6 ounces of pure alcohol per hour.