How Long Does Unopened Gourmet Tinned Food Last? September 10, 2026 0 39 How Long Does Unopened Gourmet Tinned Food Last? A tin of Galician cockles, hand-selected Bonito del Norte or roasted piquillo peppers can wait patiently in the pantry. But knowing how long a gourmet preserve lasts is not simply a matter of checking a date: it means understanding the production process, the packaging and how it is stored at home. A great Spanish preserve is made to keep the product at its best, not to be forgotten at the back of a cupboard.