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They can be kept for years, if frozen.
Cookies can last a very long time when stored properly. I use a metal box and line it with wax paper and covered after each use can keep them fresh for a long time. You'll know when they aren't as tasty as you would like them it's time to toss.
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them