Rubber Duck
The common rubber duck demonstrates remarkable resilience under typical operational conditions. Constructed from plasticised polyvinyl chloride or, in premium specimens, natural rubber compounds, these buoyant sentinels can withstand thermal fluctuations between 0°C and 60°C without structural compromise. Field studies indicate an average functional lifespan of 3-7 years in active bathroom deployment, though museum specimens have survived decades. However, the rubber duck proves vulnerable to ultraviolet degradation, developing cracks and losing its characteristic jovial yellow hue when exposed to prolonged sunlight. The infamous 1992 container spill released 28,000 rubber ducks into the Pacific, where some specimens remained intact for over fifteen years—a testament to their environmental persistence, if not their biodegradability.
Gandalf
Gandalf's durability operates on an entirely different ontological plane. As a Maia—one of the primordial spirits who helped shape Arda itself—his essential being predates the physical universe by an incalculable margin. When the Balrog of Moria destroyed his corporeal form, Gandalf was resurrected and upgraded by Eru Iluvatar himself, returning as Gandalf the White with enhanced capabilities. His staff may break, his robes may tatter, but the fundamental essence of Olorin persists beyond temporal constraints. He has endured over 2,000 years in Middle-earth alone, plus countless ages in the Undying Lands. The wizard demonstrates regenerative properties that make the rubber duck's seven-year bathroom tenure seem rather quaint by comparison.