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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.
15.5 gallons - in ths U.S. A keg is also known as a half-barrel. A barrel is the volume measurement of beer used in the brewing industry. Most breweries measure their capacity in barrels, which is 31 gallons. There are 128 ounces in a gallon. There are 1984 ounces of beer in a keg. 15.5 gallons - in ths U.S. A keg is also known as a half-barrel. A barrel is the volume measurement of beer used in the brewing industry. Most breweries measure their capacity in barrels, which is 31 gallons. There are 128 ounces in a gallon.