What is the shelf life of vermouth and how can I ensure it stays fresh for as long as possible?

The shelf life of vermouth is typically around 3 to 6 months after opening, but it can vary depending on the brand and storage conditions. To ensure it stays fresh for as long as possible, store vermouth in a cool, dark place away from direct sunlight and heat. Keep the bottle tightly sealed and consider refrigerating it to extend its shelf life.