What is high mileage for a diesel truck?

I've seen 5.9L I-6 Cummins diesels with 400,000 miles and 500,000 miles. But the greatest one I've ever saw was a 7.3L Powerstroke that had 1,000,000 miles. And I seen a 7.3L IDI Ford/International engine that had 391,000 miles. Once, I worked on a 2005 Ford F-350 with the 6.0L Powerstroke engine and it had 950,000 miles. It was the 3rd time it had been in the shop. It had 1 blown turbo and 2 injectors and that's it. It was in the shop for another injector.