R3 Brakes pads due?

Pretty much what the Dr says. Not trying to a smart ass, it genuinely is "when it's time" item and there is no "normal" interval due to differences in the operator's habits.

HH pads will extend your replacement interval vs stock.

I kill a set of rear pads every 8k or so, fronts last about 12k. I'd rather replace pads than clutches, so I don't go downward through the gears for lights on the Rocket. Clutch in, apply brakes, drop gears without engine braking.

It depends on how you ride, if you trail brake or drag the rear for low speed stability, if you use the rear to tighten a line mid corner vs roll off throttle, pad compound, weight etc.
 
If you have any question about brakes....Change them!!!