The longevity of an opened bottle of wine left on the countertop without refrigeration depends on various factors, including the type of wine, the ambient temperature, and the level of exposure to oxygen. Here are some general guidelines:
Fortified Wines: Fortified wines like Port, Sherry, and Madeira can last longer than regular wines after opening. They typically have a higher alcohol content, which acts as a preservative. When stored in a cool, dark place and properly sealed, these wines can remain drinkable for several weeks to a month.
Red Wines: Red wines can also tolerate being left at room temperature for a short time, especially if the room is relatively cool and dark. Depending on the specific wine, an opened bottle of red wine can stay drinkable for up to 3-5 days after opening if properly re-corked or sealed.
White and Rosé Wines: White and rosé wines are more delicate than reds and can start to deteriorate more quickly when exposed to air. You should ideally consume an opened bottle of white or rosé wine within 1-3 days if left at room temperature.
It's important to note that high temperatures and exposure to direct sunlight can accelerate the oxidation process, causing the wine to go bad more quickly. Therefore, if your room is quite warm, the wine's drinkable lifespan may be reduced.
For the best results and to extend the life of an opened bottle of wine, it's generally recommended to refrigerate it, even if you don't plan to drink it all at once. Storing the wine at a cool temperature (ideally between 40-65°F or 4-18°C) in the refrigerator will slow down the oxidation process and help preserve the wine's quality for a longer period. If you have a wine preserver, you can also use it to displace the air in the bottle and further extend the wine's drinkability.