What is the storage duration for cornmeal or flour in the large bin?

Cornmeal and flour stored in large bins can effectively remain usable without a specific expiration date if they are kept in optimal storage conditions. This means they should be stored in a cool, dry place, away from moisture and direct sunlight, to minimize spoilage. Over time, the quality may degrade, and there may be a decline in freshness and flavor, but proper storage can extend their usability significantly.

In contrast, the other options suggest specific time frames that imply the products will no longer be usable after that period, which is not accurate if stored properly. While certain types of flour and cornmeal may have best-by dates for peak quality, they do not become unsafe to use after a certain time if they remain uncontaminated and are stored correctly. Hence, the notion of having no expiration date aligns more closely with how these products are managed in a bakery setting.