Nothing published to my knowledge.
There was an interesting article in AOPA's drone division discussing MTBF (-Mean Time Before Failure). On many drones, the engines are designed for as little as 50 hours, and with no redundancy!
Drone Valley suggested that you remove your props every 10 hours and inspect, and hold them by their tip. If the other blade sags, that's a clue that the rivets have worn.