The comment I made about the 4-stroke engines can be applied to the 2-stroke engines.

With all engines, though, most never last beyond 30-50 hours because they're badly-maintained, crashed, just run poorly, and so forth. The vast majority of engine problems, regardless of engine brand, are user-caused, and not due to the engine's design or manufacture. Take care of the engine, keep it clean and corrosion-free, don't run it overlean and it should last a very long time.