How long can oatmeal cookies last without refrigeration?
How long they will last (3-5days )isn’t the only problem you face. People want to buy those things when they are fresh and the stores regularly check the best by date each day. Normally on day 2 they will reduce them and still try to sell them, but will expect you to pay for that reduction. On day 3 they may ditch them then. or mark them down further and expect a further credit from you. I have closely observed this as I am one of those people who buy that type of product as treats. It doesn’t matter to me as they will last the full 5 days or longer. They may get a little stale once open in the biscuit tin, and are still edible. Sugar is all the preservative you need. Good Luck.