Peeked in with my flashlight and mirror and the front pads show what I would guess is half a pad left. Rig has 53K miles. Original pads as far as I know, purchased rig with 19K on it.
My 32' Winnie had 46,000 miles on the original pads. I was getting some rust pitting on the inside of the rotors along with some glazing causing the annoying low speed squeak, so I replaced the rotors and pads. The original pads still had about half material left. BTW, replaced the pads with EBC "green" , very happy with them.