Stainless steel nails can last several decades to a lifetime, depending on the environment and application. 304 stainless steel offers excellent corrosion resistance for general outdoor use, while 316 stainless steel provides superior durability in harsh environments, such as coastal or marine conditions. Unlike galvanized nails, stainless steel does not rely on a coating that can wear off over time, making it a long-term solution for projects requiring rust and corrosion resistance.