How long will keg last once used


We run mobile bars so may leave a job with half a keg or more of Becks/beer still remaining (60/40 mixed gas). If this keg is tapped, then taken off the lines and stored in a chilled cellar until next needed, how long can I expect it too retain it’s taste and freshness?
Google answers vary from 7 days to 4 months.
Thank you.


  1. Once you have introduced bottle gas to the beer, it starts to deteriorate we used to say after about five to seven days it doesn’t taste the same as it did on day one.

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