How long will my beer stay fresh in a mini keg?
As long as the mini keg has not been tapped and you keep it refrigerated, it should stay fresh for a couple of weeks. However, once the beer has been carbonated (or if you filled the mini keg with finished beer from a larger keg), it is ideal that you plan on consuming the beer within one week. After the mini keg has been tapped, the beer will be best if it is consumed within a few days.