It’s all about storage!
Once opened your BiB should last 7 – 10 days but could last upto 3 weeks depending on the condition that it is kept in. This is live beer so does need to be treat with some care!
To extend the shelf life of your beer, store unopened BiB (and bottles of beer) in a cool, dark area away from direct sources of heat or light; too much exposure to light can cause unopened beer to develop an off taste. Store the beer at a temperature between 12c and 15c (colder than the typical room temperature, but warmer than a refrigerator) - if this is not possible, store the unopened beer in the refrigerator.
Properly stored, unopened beer will generally stay at best quality for several months, although it will usually remain safe to use after that. We provide an indicative Best Before Date on each Box. This is not a safety date; it is our estimate of how long the unopened beer will remain at peak quality. The beer will be safe to drink after the "expiration" date on the package provided it is properly stored and the package is undamaged.
Storage times shown are for best quality only - after that, the unopened beer's colour or flavour may change, but in most cases, it will still be safe to consume if it has been stored properly. If unopened beer develops an off odour, flavour or appearance, it should be discarded for quality purposes.
Sources: Based on information provided by StillTasty's Shelf Life Guide