Prop Change? How Often?

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I've had my P3P for a couple of months now. Healthy Done says I've had 90 flights with a total of 13 hours in the air. I'm not seeing any cracks anywhere, but with the forces imposed on the props I'd imagine once a crack develops it would quickly turn into a break, throwing the rotor out of balance, imposing greater stress on the remaining props and having a possibly cascading effect downhill from there. So it seems prudent to rotate the props out at some interval before a problem develops. Is there a best practice for this?
 

N017RW

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Numerous threads on this.
Props will last years if not damaged by crash or collision.
If you don't see any physical damage your fine. The props on my P2 have been in use since mid-2014.
 
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Over 400 miles on my P3P. I started using a second set of props at the 300 mile mark just because they were cheap, I don't think it was necessary.
 

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