Rather unbelievably, in my fairly light four-cylinder 190E I had new original MB pads at about 66-67,000m in the front. And just recently, I ran them grinding heavily because I couldn't believe they were gone. I finally checked and was amazed that they were completely worn down, at about 77,000 miles.
10,000 miles per set, on a 190E?!! They don't get used hard regularly, and I'm always changing to lower gears to help slow down.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black