The answer to 'lifespan of switch' is that a typical light switch can last 10-20 years or more with normal use. The lifespan of a switch depends on factors like the quality of the switch, how often it is used, and the environment it's installed in. Higher-quality switches made with durable materials like porcelain or heavy-duty plastic tend to last longer than cheaper, basic switches. Switches that are turned on and off frequently will wear out faster than those used less often. Switches in humid or dusty environments may also have a shorter lifespan due to corrosion and buildup.
With proper installation and care, many switches can function reliably for well over a decade. However, it's a good idea to periodically inspect your switches and replace any that are showing signs of wear, like cracks, looseness, or difficulty toggling. Replacing an old, worn-out switch can help prevent electrical issues and ensure your home's lighting and power circuits continue to work safely and efficiently.