There’s no official data on LED wear in LEGO kits, but we can make some educated assumptions. Light My Bricks offers guides and troubleshooting tips, which suggests that minor issues with components, including LEDs, can happen. They even sell replacement parts, meaning LEDs can be swapped if needed.
Generally, LEDs have a long lifespan. However, durability in LEGO kits can vary based on LED quality, usage frequency, power source, and environmental conditions. Take care of your kit to ensure it lasts as long as possible.