Thinking back to racing days we did not expect more than a few thousand on a set of Campy rings and I was hardly the roughest on equipment. Shops that serviced racers had stacks of rings, Regina cogboxes and SunTour cogboards. It all turned over quick. Quickest chainring wear ever was a guy who tried to dip a toe in track racing with what he had on hand. Tried to race on a Stronglight 93 road ring. The ring was clean, the chain tension was good, he asked me to check it for him. Three short races, one evening of racing, and that ring was powdered. This was not a monster, it was a 15 year old kid weighing maybe 140 and racing intermediates.
How long the ring lasts depends on how hard you kick the pedals.