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Keg beer lasts about a month once opened/tapped, but that's assuming that you have a way to maintain pressure in the keg. Usually this is done with a CO2 gas feed that maintains the pressure inside the keg to keep the carbonation in the beer.

If you mean the typical 5 liter mini keg you can buy on a store shelf, most have no pressurizing system. Once opened the beer will go flat in a couple of days. There are mini kegerator systems out there that will maintain the pressure, however.

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13y ago

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