000 is easy, apparently it was a refill and not the original.
Only used 2 weeks, approx. 1000 pages, printer prompts for toner change. It should have been enough for 10,000 lungs, apparently it was a gas station, and not the original PS. Next time I will buy through Costco.
Pros
HP 641A (C9723A) toner cartridges work with: HP Color LaserJet 5500, 5550.