Answer:
FireLine and Fluorocarbon can last quite a long time. Regular mono like Berkley Trilene XL or XT, has good shelf life provided it is not exposed to direct sunlight or water. Buy your line from a dealer with a high-volume turn over … meaning they don’t have stock on the shelf for very long. Stores like Bass Pro Shops, turn their stock quickly and frequently.

Good Luck Walleye Fishing