Why replenishment matters more than packing months of rations

How long could a modern destroyer remain at sea if loaded with enough food?

For months, and potentially much longer with replenishment at sea; support and machinery matter more than filling the ship with rations.

The hypothetical asks how long a destroyer could remain at sea if packed like a wartime submarine. The decisive factor is the replenishment force because fuel, food, stores, and maintenance support need not all be carried from the first day. With regular replenishment at sea, a functioning ship can remain deployed for months and potentially much longer. Mechanical reliability, crew endurance, and the support train matter more than the initial ration volume. What begins as a ship-storage problem is really a question about the logistics system that determines naval endurance.