On average, the human body can dispose of the alcohol in a 12-ounce beer in about:

On average, it takes the body about one hour to remove the alcohol content of 12 ounces of beer or wine coolers, 5 ounces of wine, or 1.5 ounces of hard liquor. In a 150-pound male, one of these drinks will raise the blood alcohol content (BAC) by about 0.02 percent. The removal of alcohol from the body may be slower in women, resulting in a higher BAC over a longer period of time.