For safety/health/legal reasons, let’s just say 1-2 weeks in a sealed non refrigerated container, 2 months in the fridge, and 6 months to a year in the freezer. In reality, dehydrated meals will last much longer than you’d think and depends on how and where it’s stored. Anecdotally, when we prepared for the John Muir Trail the majority of our meals were made weeks before we mailed our resupply, our resupply was sent out 5 weeks before we picked it up, and then we carried it up to 8 more days. No one got sick and everything tasted great. When in doubt, use your sense of smell and taste for anything that might seem off.