I ride over 20,000 miles a year, now days I have more then 1 bike so they are spread out some but a not to long ago before i retired i had 1 bike a 1987 FXR, rode that bike for 9 years and put 177,400 miles on it.
It was not babied but it was well maintained, and the current owner is riding it daily but he did a full frame up rebuild on it 2 years ago.
Harley's will last as long as you let them.