I've been flying P3 with 2 sets of props totally 10 hours, and worrying when to change. 1 set mowed grasses, once turned when takeoff (rapid CSC stop saved), and 1 set never hits anything... but sometimes mince insects, also few hours x 10,000rpm of centrifugal force will wear them, I think. Fortunately P3 has flight records, we can know how many hours a set of props is used. I don't want to save $20 and lose $1,300, but also don't want to throw away normal props. Any opinion/info about lifetime of props? And how we can tell we need to change if props are hit lightly but seems to be normal?