How Long Will A Growler Last Once Opened in How To

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How Long Will A Growler Last Once Opened. Growlers of beer will stay fresh for several days (some say up to 10 days) if left unopened. Growlers of beer will stay fresh for several days (some say up to 10 days) if left unopened.

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Once opened, however, leftover beer will be flat within 36 hours at best. However, once opened, the beer will go flat in about 36 hours or less. Once opened, the growler of beer will only be good.

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Once opened, you should consume the beer within 24 hours. Once opened, however, leftover beer will be flat within 36 hours at best. Once opened, however, leftover beer will be flat within 36 hours at best. Bing, that a tightly capped growler can easily last 4 weeks or more until it is opened.