Honestly... regular aircraft use... with no crash damage... they will live for a VERY long time. I can honestly say I've never had a name brand servo die for no reason. In my +30 years... the only servos I've had "Burn out" are tail servos on my Heli's. The problem there is... the Gyro is driving the piss out of them. In my helis... I will replace the tail servo every year.


With that said... if you have a gyro in your jets... I would replace the servo it's hooked to every year or two. (but it's still not getting driven like a heli tail)