红酒开了最多能放一周左右。红酒在打开后，酒液与空气发生氧化反应，一周后红酒就会氧化过度，开始走向衰落期，这个时候的红酒依然能饮用，但是口感已经变差。
葡萄酒是一种活的饮料，会随着时间而改变。打开酒瓶后，当氧气与葡萄酒接触长时间后，它会改变葡萄酒的颜色，降低葡萄酒的香气，使葡萄酒的味道变淡。软木塞将葡萄酒密封在瓶子里，创造了一个气密的空间，让葡萄酒很少或者没有氧气，从而保存了它。然而，当你打开软木塞时，空气会到达葡萄酒，并立即开始变质。
红酒打开之后可以放多少天
打开红酒保存方法
1）冷藏放置：可以放置在冰箱内，当然如果有立的冰箱存放是好的，这样可以防止窜味。
2）重新封口：把瓶塞完全按照原样塞回瓶子里，并用保鲜膜缠绕，防止空气进入。
3）直立放置：这样可以减小酒液和瓶中空气的接触面积，减缓氧化速度。
4）换瓶：如果有纯净干燥的螺旋盖葡萄酒瓶，可以选择将剩余的葡萄酒倒入新酒瓶中，然后拧紧螺旋盖冷藏放置即可。
冰箱冷藏可以放1周
红酒开瓶后没喝完，把软木塞塞回，酒瓶直立摆放，在冰箱中冷藏保存1周。可在红酒瓶外加塑料袋防止冰箱中气味影响红酒风味。冰箱中冷藏温度会多少影响红酒的风味。
常温可以放1-3天
酒精度低的红酒没喝完塞回木塞在常温下可保存1天，酒精度高的红酒也只能延迟3天时间。
排空气法可放2-3天
采用真空泵抽走瓶中空气，或用惰性气体填充方式可防止红酒氧化变质，这样的红酒能保存2-3天，不超过1周。
开过的红酒有保质期吗
因为怕葡萄酒失去最佳风味，很多人打开葡萄酒后都是一次喝完，但是如果实在喝不完，也不必勉强，事实上葡萄酒开盖后的保质期没有你想象的那么短。
There are many stuffy rules about wine, from the type of container it should come in to how expensive it should be. One common myth is that a bottle of wine should be fully consumed the same day it’s opened. While it’s true that vino does start to oxidize the moment the cork comes out, that’s no reason to guzzle a liter of it all by yourself, or pour your leftover liquid down the drain. According to Bon Appétit, an open bottle of wine is still good for several days—as long as you know how to store it properly.
从装酒的容器到酒的价格，关于葡萄酒有很多老讲究。一个常见的误解是一瓶葡萄酒必须在开盖的当天喝完。尽管一开盖酒就会开始氧化，但是没有必要因此独自干掉一整瓶，或者将剩余的葡萄酒倒进下水道。据美食杂志《好胃口》称，只要储存方法得当，葡萄酒开盖后可以保鲜好几天。
If you pop open a new bottle of cabernet just to have a glass or two, hold onto the cork. Corks have been an important part of the wine-making process for centuries. The material is dense enough to keep liquids fresh without sealing off air altogether. A minimal amount of oxygen allows the flavors of the wine to continue to develop, while too much oxygen creates an acrid, unpleasant taste.
如果你打开一瓶新的赤霞珠红葡萄酒只是为了喝上一两杯，那么不要丢掉木塞。几个世纪以来，木塞一直是红酒酿造流程的一个重要部分。木塞材质的密度足以在不完全隔绝空气的情况下保持酒的新鲜。瓶中有少量氧气可以让葡萄酒继续发酵，而氧气过多则会导致葡萄酒变得酸涩，口感不佳。
Once you’ve finished pouring your wine, squeeze the cork back into the bottle to prevent any more oxygen from reaching the drink. If you’ve damaged or accidentally tossed out your cork, a bit of plastic wrap with a rubber band, aluminum foil, or a reusable wine bottle stopper will work, too.
一旦你倒完酒，就要立即用木塞密封酒瓶，防止更多氧气进入瓶中酒。如果你损坏或不小心扔掉了木塞，你可以用橡皮筋和铝箔包住一团保鲜膜作为瓶塞，或者用可重复使用的酒瓶塞。
Storing your opened wine in the fridge limits its exposure to other damaging elements like heat and light. Once it’s refrigerated, most red and white wines will last two to five days before their flavors take a turn for the worse. Sparkling wines, however, have about one to three days before they’re no longer drinkable, and some natural wines can go bad in a day. The highly tannic red wines available at the supermarket generally last the longest after being opened, with a lifespan of up to seven days.
将开盖后的葡萄酒放在冰箱里，可以减少葡萄酒接触热和光等其他会导致葡萄酒变质的因素。只要放在冰箱中，大多数红葡萄酒和白葡萄酒都可以保持2到5天不变味。不过，起泡葡萄酒开盖后只有1到3天的保质期，有些天然起泡葡萄酒开盖后一天就变质了。超市卖的高单宁红葡萄酒通常开盖后保质期是最长的，最多可以保鲜7天。
Because expiration dates vary so greatly between wine varieties, the best way to judge the freshness of what’s in your bottle is to give it a taste. Overly oxidized wine doesn’t taste great, but drinking a test sip of it won’t make you sick. If you’d rather avoid drinking potentially spoiled wine, you can also judge its quality by sight and smell. Wine that’s developed a brown tint and/or a vinegary smell has oxidized, meaning it’s time to toss it and open a fresh bottle.
由于不同的葡萄酒品种保质期差别很大，判断葡萄酒是否新鲜的最佳方式就是尝一尝。过度氧化的葡萄酒口感不佳，但是试喝一口不会让你生病。如果你实在不想喝可能变质的葡萄酒，你也可以通过外观和气味来判断它的品质。颜色转为褐色或散发出酸味的葡萄酒已经氧化了，这说明你该把它扔掉，再开一瓶新酒了。
