Q: How long does wine last after it’s opened?
You might have this thinking, does wine go bad?
Answer: Most wines last open for only about 3–5 days before they start to go bad. Of course, this greatly depends on the type of wine!
Don’t worry though, “spoiled” wine is essentially just vinegar, so it’s not going to harm you. Here’s how long different styles of wine last open.
Image credited to winefolly.com
WHY WINE GOES BAD?
Short Answer: Wines stored after opening can go bad in two major ways. The first way is when acetic acid bacteria consume the alcohol in wine and metabolizes it into acetic acid and acetaldehyde. This causes the wine to have a sharp, vinegar-like smell. Additionally, the alcohol can oxidize, causing a nutty, bruised fruit taste, that robs the wine of fresh, fruity flavours. These are both chemical reactions, and so the lower the temperature you keep a wine, the more slowly this will happen.
Source credited to winefolly.com.