How many hours can a APU last?

Excuse me, could you please elaborate on the lifespan of an APU, or Advanced Processing Unit? Specifically, I'm curious to know how many hours of continuous operation can one typically expect from an APU before it begins to show signs of wear or performance degradation? Is there a standard benchmark or industry estimate for this metric, or does it vary significantly depending on factors such as usage patterns, cooling efficiency, and the quality of the APU itself? Thank you for your time and consideration.