It depends on the knife and how it is used. A well-made knife should last for many years with proper care and maintenance. However, **Spyderco Para Military 2** sprint run with M390 blade and carbon fiber handles is one of the most popular and best-selling pocket knives built to last. It is made from high-quality materials and is designed for the type of use you plan to put it through. With proper care, it should last for many years.