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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 Different Sizes of Kegs. In the United States, kegs are classified into different types. For instance, a half keg has a capacity of 15.5 gallons, an import keg 13.2 gallons and a pony keg 7.75 gallons. Aside from these, there is also a half barrel, the capacity of which is 6.6 gallons.