For the 6.5 crowd 100K is the general life recommendation especially if towing my Burb with 130K has originals & overdue per general recommendations but has had a fairly easy life as a people mover, plan there is to get some tips & rebuild myself I bought a knockoff copy of a Bosh pop tester a few years ago I've yet to try out.
The truck has had 2 sets; 1st set @ 60ishK performance injectors from Kennedy when starting to build for power, 2nd set of performance injectors from Heath at 160K, were they bad ? I don't know but since that is my "heavy hauler" I erred on side of caution and followed the 100K recommendation for service cycle. 215K on the truck now so half life on installed injectors with 50K on those