I upgraded to a RSR clutch by HS Tuning about 15,000 miles after tuning to APR Stage 1. Total mileage on the car was 34k at the time. My factory clutch slipped only under certain conditions in the cold, but I upgraded early anyway. The RSR clutch is said to hold 380 lb-ft. I went to APR Stage 2 later the same year
(2018). I upgraded to an IS38 and appropriate APR tune at 128,000 miles in July 2021. I'm right at the limit of the clutch. It slips just a hair at lower RPMs in cool weather... and I mean a hair. I was going to switch to a Stage 2 Endurance by SBC, but the RSR clutch holds fine 99% of the time. The car has 172,000 miles now. I'll consider another clutch upgrade if the slipping gets worse.
I don't track or race the car, but it does have over 30,000 miles of trailer towing under its serpentine belt:
I'd say having 138,000 miles on a clutch upgrade says a few things to their potential for longevity!