I've ridden my (heavy!) e-bike for a few thousand miles, and although I've replaced tubes and tires, I'm still on the original disc pads. I don't think they're anything special, just middle of the road cable actuated stuff. Do pads usually wear faster? Honest question.
Depends on the riding conditions. The pads on my road bike lasted about 10,000km. In 12,000km my mountain bike has needed 6 sets of pads and 1 set of rotors.
