Rear Conti GP 4000s lasted about 4000 miles. Rider weight is approx 150 lbs, no gravel roads but a lot of chip seal. Front tire that was put on at the same time shows no wear at all, will probably be retired due to dry rot before it wears out.
Armadillos have perhaps the worst ride of any tire I have ridden on. Harsh, slow, ZERO grip when wet, and not any more flat proof than most other tires (IME). Words cannot express how terrible these tires are.