I think it would take years.
When I was a truck mechanic back in the 70s-80s, I saw a lot of Owner-Operator rigs with loose/missing air intake piping, dirty air filters, etc. and never came across a engine "dusted". Maybe the engines were built better (or had looser tolerances) in those days.
I was often surprised how poorly some of these trucks were maintained in the early days of "deregulation". Probably just due to a bunch or entrepreneurs getting into the trucking business for the first time without knowing much about trucks/engines.
I think the new electronic engines are more susceptible to having injector issues from dirty oil and bad fuel than than dirty air.