The answer to 'how long does panel upgrade last' is that a properly installed electrical panel upgrade can last for 25-40 years or more with proper maintenance. Electrical panels are a critical component of a home's electrical system, and upgrading to a newer, larger panel can provide increased safety and capacity to handle modern electrical demands.
The lifespan of an electrical panel upgrade depends on factors such as the quality of the installation, the size and capacity of the new panel, and how the homeowner cares for and maintains the system over time. Regular inspections, avoiding overloading the panel, and promptly addressing any issues can help extend the panel's useful life.