How Long Can a Bottle of Wine Stay Open?
Briefly

"The ultimate deciding factor is quality. The better the wine, the longer it will keep in an open bottle...It's not actually what's in that space above the wine that makes the difference, but what's absorbed into the wine at the moment of opening."
"The wine will not rapidly oxidize, if it's been well made..."
"With red wine, similarly, it will comfortably be in good shape for three to four days," says Belsham. "The more tannic the wine, the longer it will hold up after opening. So, a big, hearty Barolo or Cabernet Sauvignon will last longer than a light Pinot Noir or Barbera. But as a broad guideline, three to four days is a good rule of thumb."
Read at Wine Enthusiast
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