How Long Store-Bought Cookies Will Stay Fresh On Your Counter - Tasting Table
Briefly

Baking cookies from scratch is enjoyable, but on low-energy days, store-bought cookies like Oreos or Girl Scout cookies provide quick satisfaction. These cookies can last for weeks if stored properly, thanks to self-stable preservatives. Dry cookies with fewer perishable ingredients last longer, typically a few days at room temperature, weeks in the fridge, and months in the freezer. To maintain freshness, it's crucial to use airtight storage solutions, such as plastic containers or Ziplock bags, rather than the original packaging.
If you really want a long-lasting cookie, go for one on the dry side with fewer perishable ingredients (i.e. something like Oreos over shortbread).
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