I did a search & couldn't find any answers, maybe because there is no definitive answer, but, Is there a lifespan for props? Mine are clean, no chips & no visible damage of any kind, but, I;m thinking they're only plastic, revving full speed from liftoff to landing. I;m not sure Phantom 3's cruise RPM, - 3500-6500rpm? Will the plastic eventually fatigue or has DJI ever stated - You should change your props every---- ??