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Due to a variety of beer styles and storage options for your keg, thereâs no set answer to this question. Depending on who you ask or what site you read, the answer will range between 20-120 days.
The US beer barrel is officially defined as a volume unit which is equal to 31 gallons. This is why a full keg is named a half barrel, though it has 15.5 gallons. Most brewers use this kind of kegs, so we can make some calculations and answer how many beers are in a keg. One full keg contains: Almost seven 24-racks of 12 oz cans.