Mars
Mars has demonstrated exceptional longevity, having existed for approximately 4.6 billion years. The planet has survived asteroid bombardments, solar radiation, and the complete loss of its magnetic field without complaint. Its iron oxide surface continues to oxidise with admirable persistence.
Geologists note that Mars shall likely persist for another five billion years, until the Sun's expansion renders such considerations moot. This represents a durability record that few household items can match.
Rubber Duck
The typical rubber duck exhibits a functional lifespan of three to fifteen years, depending upon frequency of use and exposure to ultraviolet radiation. Inferior specimens may develop cracks, discolouration, or that peculiar black mould that bathroom scientists prefer not to discuss in polite company.
However, rubber ducks have proven remarkably replaceable. When one expires, another identical specimen can be obtained within hours. This strategy of serial immortality provides a form of durability that planetary bodies cannot replicate.