How long can racked beer last in a cask before losing its carbonation?

The ideal duration for how long racked beer can last in a cask before losing significant carbonation is typically around 24 hours. After this time frame, the beer is at risk of undergoing oxidation and losing its freshness and effervescence due to exposure to oxygen. While some factors could potentially extend its carbonation for a short period, generally, racked beer should be consumed within this 24-hour window to ensure it maintains optimal flavor and carbonation levels. The cask, while designed to retain some carbonation, is not a sealed system like a bottle or keg, so the longer beer sits in it, the more likely it is to lose its desired qualities. This is particularly important for styles that are known for their lively carbonation, such as pale ales or IPAs, where fresh hop character can degrade rapidly.