The answer to 'how long does shut-off valve last' is that a properly installed and maintained shut-off valve can typically last 20-30 years or more. Shut-off valves are an essential component of a home's plumbing system, allowing you to turn off the water supply to a specific fixture or the entire home in case of a leak or other plumbing emergency.
The longevity of a shut-off valve depends on several factors, including the quality of the valve, the water pressure and mineral content in your home's water supply, and how often the valve is used. Valves made of brass or stainless steel tend to last longer than those made of cheaper materials. Valves that are rarely used are also less prone to wear and tear over time.