How long can I run my APU?

I'm curious about the longevity of my APU, or Application-Specific Integrated Circuit, used for cryptocurrency mining. Can you tell me how long I can expect it to run efficiently before needing replacement or significant maintenance? I'm interested in maximizing my mining output and want to ensure I'm not pushing my hardware beyond its limits. Is there a general rule of thumb or factors I should consider to prolong the lifespan of my APU?