How often do the blades need to be changed?

[Huge Bama Fan]

I believe this small cut is considered damage and shouldn't be used , right?

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That one is trash

 

[Steve R]

I would not. the imbalance on the motor bearings and potential for AC loss is not worth it.

Elon Musk commented in the last few weeks about this sort of attitude to aircraft maintenance and why we don't have flying cars yet. people don't understand why aircraft maintenance is so critical, when something breaks inflight it's not just a matter of coasting to the side of the road like it is in your car.

Mr. Musk is spot on. With ANY aircraft, when in doubt, change it out! Much, much better off in the long run.