The answer to 'surge protection replacement schedule' is that surge protectors should be replaced every 3-5 years, or sooner if they have been subjected to a major power surge. Surge protectors wear out over time and can become less effective at shunting excess voltage to ground. Replacing them on a regular schedule helps ensure your home's electrical equipment remains protected.
Most surge protectors have indicator lights that will show when the protection has been compromised. If the light goes out or the protector stops functioning, it's time to replace it. It's also a good idea to replace any surge protector that has been hit by a major power spike, as the internal components may be damaged even if the lights are still on.