Guessing cycles.
If i were to guess based on my own experience...but base it on track time around 300-350 heat cycles.
How long till its completely useless,800 or so. Maybe 6 years as a daily driver.
I pulled my pioneer off after 3 motors and 15 yrs... its about as hard as the edge of a sheet masonite.
Reminds me i need 2 dampeners, a throttle plate and a set of header gaskets.