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This answer depends on the environment. If, for example, you are talking about in a kitchen in a maintained household, the water will be good for probably a few days. After that point, there will be so much dust in the cup that you'd probably just want to get a new glass of water. But out in the woods, a cup of water would probably last a few hours unattended. Insects and such will get into the water and may possibly contaminate it. In a snowy or very cold environment, you could probably leave it out for a day, since most insects won't be about.

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13y ago
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15y ago

Um...like forever! water doesn't go bad. unless it's contained in a water bottle for a really long time in hot temperature.

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Q: How long can you leave a cup of water sitting out for and still drink it?
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