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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.
Commercial Kegs: Commercial style kegs all have the same fitting up top (discussed above), but there are different sizes of commercial kegs. There are 4 main sizes of commercial kegs that are used regularly. Sixth Barrel, Short/Quarter Barrel (AKA Pony Keg), Slim/Quarter Barrel, and the Half Barrel. Commercial Keg sizes are as follows: Sixth Barrel (23.3â³x9.25â³D) | 55 -12oz.