Piston engines like you get in a Cessna 172 are also about the worst-case for overhaul times, since there's so much mechanical complexity and because they're of

Piston engines like you get in a Cessna 172 are also about the worst-case for overhaul times, since there's so much mechanical complexity and because they're often run at/near maximum rated power for long periods. Turboprop engines (effectively these are jet engines with propellers attached) like the ubiquitous P&W PT6A have TBOs up to 4,500 or even 6,000 hours.