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It will last indefinitely, but the taste will be ruined within months or weeks even, especially in hot weather. It's the exposure to the air in the bottle that does it, so transfer leftover whisky to smaller bottles so that they are full. Better still, drink it.

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15y ago
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13y ago

In my case, about 3 hours.

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Q: How long does an opened bottle of single malt whiskey last?
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