All depends on what you call end of life, and what you are prepared to do....
if you’re trying to shoot world record benchrest groups, you might call it done at 1200
if you’re chest shooting foxes for the local farmer it might be good for 20000.
I had a savage 110fp in 223 many moons ago that started its life capable of better than 0.25moa 5 shot groups. I used it to shoot club, state and national level matches.. over time I had to adjust the load, chase the lands, change projectiles. At roughly 5k rounds it was no longer competetive for matches, but was still plenty good for pest control spotlighting (cats foxes rabbits hares) gave up counting rounds down the tube at 15k. Sold it off at an estimated 20k when, no matter what load, it could not do better than 1.5moa. The buyer thought it was a bargain, and thought it was plenty accurate...