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That's a good question, I googled the very same just as I took a sip of a Starbucks Americano that is probably 3 days old, taste "fine" too me, but to answer your question; a coffee aficionado may disagree, but day old brewed coffee (black) is not a problem, it will just taste bitter, but perfectly safe to drink.

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13y ago
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13y ago

If it's ground - 24 hrs

Whole bean open package - 7 days

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Q: How long does it take for coffee to go bad?
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