Indulging in whisky is a leisurely affair, quite distinct from the time-sensitive nature of wine consumption. Unlike wine, there’s no rush to finish an opened whisky bottle within a set timeframe. Yet, a pertinent question arises: Does whisky have an expiration date, especially after you’ve poured your first dram and returned it to the confines of your bar cabinet? In brief, yes, whisky does have a shelf life after being opened, contingent on the level of liquid remaining in the bottle. The interaction of whisky with oxygen triggers oxidation, ultimately leading to its expiration. The volume of whisky in the bottle plays a crucial role, with a fuller bottle minimizing the ingress of oxygen, and preserving the spirit, whereas an emptier bottle increases the risk of oxidation. The longevity of an opened bottle of whisky is intricately tied to its fill level. If the bottle is at least half-full, the whisky remains enjoyable for one or two years. However, as the liquid depletes, with only a quarter or less remaining, the expiration clock accelerates to around six months, as per insights from The Tasting Table. Upon unsealing, the alcohol content can decrease due to ethanol evaporation, altering the taste profile. For example, the extended exposure of rich, peated scotch whiskies to air diminishes their intensity over time.