@bigsmooth125 Good question.
I don't have answers, but I feel like mentioning that if you're into really pushing the car hard, especially over rough pavement, the OEM suspension is simply not useful. It doesn't matter to me if my OEM M3P dampers could stay within their spec for 150k miles (made up number!) because they functioned as a proper sporty performance suspension for exactly
zero miles.
Don't get me wrong, the Model 3 itself feels fundamentally sporty and fun and I absolutely enjoy driving stock Model 3's, but some aspects of the suspension - damping especially - really hold it back when trying to drive it very fast through a fun twisty road.
(This applies to 2021 Model 3 OE suspension including M3P. Older Model 3 were a bit firmer and sportier, though still far from the level of Redwood or MPP suspension.)
The big name damper manufacturers often publish rebuild interval recommendations but I believe they're generally assuming racetrack use or a mix of street and track use, depending on the product line. I think they also hold their products to a much stricter performance standard - again with racetrack use in mind.
When I was researching this stuff I didn't really come across many stories of people feeling a need to rebuild reputable dampers like Öhlins DFV and KW v2/v3 (what Redwood and MPP, respectively, custom build into their coilovers) in purely street applications, unless there was some questionable history involved (used parts of unknown providence). For track rat cars seeing significant racetrack time, yes, rebuilds are a thing. Sometimes from the dampers feeling worn, other times just to change the valving especially if changing spring rates. Everything needs rebuilding or replacing with enough track use anyways.
The rest of the hardware in a coilover kit, like springs, mounting parts, etc I would expect to last a very long time unless it's super cheap low budget stuff (not Redwood or MPP). One exception: top hats, whether OEM or aftermarket. Mounts, bushings, and bearings all wear out eventually, it's just a matter of when. (And in many cases the car can still move down the road it just won't feel as good as if the part was still new / in-spec.)