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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.
As you drink the keg, you're replacing the beer in the keg with CO2. The CO2 isn't going to stale your beer. As long as you are keeping the pressure in the keg high enough to ensure that the carbonation doesn't dissipate into the keg's head space, the beer should stay tasty for quite a long time.romatics may be lost to the head space in the keg if they sit too long. â Wulfhart Jun 8 '12 at 17:50. A keg in my fridge last me 2 weeks. have a co2 setup at 10psi. If it goes more than 2 weeks there is a problem. I am not drinking enough.....