Three to five days for a light red like Pinot Noir, recorked and in the fridge. One to three days for most whites. A day, maybe two, for sparkling. What is happening is oxidation: air reaches the wine and starts changing it, slowly at first and then not slowly. Cold slows it down and a tight cork slows it down. Nothing stops it.
The honest numbers
All of these assume the bottle is recorked and refrigerated. Left on the counter, halve them.
- Sparkling: 1–2 days with a proper stopper. Without one, the following morning.
- Light, crisp whites (Sauvignon Blanc, Pinot Grigio): 2–3 days.
- Fuller whites (oaked Chardonnay): 2–3 days, sometimes better on day two.
- Rosé: 2–3 days.
- Light reds (Pinot Noir, Gamay): 3–5 days.
- Full reds (Cabernet, Syrah): 3–5 days, and often noticeably better on day two.
- Fortified (Port, Sherry, Madeira): weeks to months. They were oxidised and stabilised on purpose.
The pattern: tannin and alcohol protect a wine, delicacy does not. Bubbles are the most fragile thing in the bottle.
What oxidation actually does
Oxygen reacts with the wine in a predictable order, and you can taste the stages.
First, it helps. A tight young red opens up. Aromas that were locked in appear. This is the whole logic of decanting, and it is why some bottles are genuinely better on day two.
Then the fruit goes. The bright, primary notes fade first. The wine is not spoiled, just quieter, and it tastes duller rather than wrong.
Then it turns. Ethanol oxidises to acetaldehyde, which is that flat, bruised-apple, slightly sherry-like note. Eventually acetic acid follows, and now you are on the way to vinegar.
Nothing here is dangerous. Oxidised wine is unpleasant, not unsafe.
Why the fridge works — including for red
Chemical reactions slow down when it is cold. That is the entire mechanism, and it applies to red wine exactly as much as white.
People resist refrigerating red because they were taught red is served at room temperature. But you are not storing it at serving temperature, you are storing it. Take the glass out twenty minutes before you want it, or just hold the bowl for a minute or two — it comes up fast.
Since a light red is better served cool anyway, this costs you nothing at all.
What actually helps, and what is theatre
Recorking. Free and the most effective single thing. Put the cork back the way it came out, or use a stopper.
The fridge. Also free, also effective, also the thing most people skip.
A half bottle. The most effective trick nobody uses. Pour half into a clean half-bottle and cork it immediately, on the night you open it. Less air in the bottle means less oxidation. This genuinely buys you days.
Vacuum pumps. Modest help. They remove some air but not all, and the seal tends to leak overnight. Better than nothing, not transformative.
Inert gas sprays. These work — a layer of argon sits on the wine and keeps oxygen off it. Worth it if you routinely open bottles you cannot finish. Overkill if you do not.
Standing the bottle upright. Slightly helpful: less surface area in contact with air than lying it down.
How to tell it has gone
Smell it. That is the test, and it is reliable.
A wine past its window smells flat, like bruised apple or nail polish remover, or sharp like vinegar. If it smells of nothing much, it is tired rather than spoiled — drinkable, just diminished.
Do not judge by colour alone, though whites going deep gold and reds going brown at the rim are corroborating evidence.
What to do with it instead of pouring it away
A tired bottle is still useful.
Cook with it. Braises, pan sauces, risotto, a bolognese. Heat drives off the volatile compounds that made it unpleasant. It does need to be wine you would have drunk a few days ago — genuinely vinegary wine makes a dish taste vinegary.
Freeze it in an ice-cube tray. Two-tablespoon cubes, straight into a bag. Deglazing a pan in three weeks' time is exactly what they are for.
Let it become vinegar deliberately. If it is already heading there, leave it loosely covered somewhere warm for a few weeks with a splash of live vinegar.
The short version
Recork it, refrigerate it, drink light reds within three to five days. If you regularly leave half a bottle, buy half-bottles to decant into — it works better than any gadget and costs almost nothing.
And if the problem is that a whole bottle is too much on a weeknight, that is a real problem with a boring solution: open it anyway, pour one glass, and put the rest in the fridge. It will still be good on Thursday.
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