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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.
One keg holds 165.333 12-ounce beers.    A US 1/2 barrel-the size of keg most people are familiar with -  is 15.5 gallons, or 1984 ounces. US 1/4 bbl (commonly calle â¦ d half  barrels) are 7.75 gallons - 1/6 bbl are 5 gallons or 5.16 gallons. + 67 others found this useful.