L lenses are known for their durability. However, they do have breakable elements and moving parts that can wear out. Durability depends on how frequently they're used and how carefully you treat them. Taking the right precautions and using the right protection, Canon L lenses can last for a lifetime. My often-used, original 70-200mm f/2.8 L and 24-105mm f/4.0 L are still working perfectly.