So, the real question is, are you asking the right question?
You want a 1911, so I'm assuming you're looking for precision and accuracy as your primary goal. That means a gun built to the tightest possible standards to eek out every little fraction of an inch of mechanical accuracy. Tight tolerances are less forgiving of abuse - specifically for things like the 2,000 round challenge run as intended with NO cleaning or lubrication during the challenge.
This is like asking for a humble, friendly supermodel who doesn't mind you leaving her at home every weekend while you go out hunting, shooting and fishing.
In my experience, Springfield guns are too tight for their own good. My RO is about 1,500 rounds into the challenge right now, but when I first received it, I literally had to use a cheater tube over the bushing wrench to disassemble it. That's excessive. My experience with Colts from the late 1980s until about 2000 was that not a single one of them ran worth a shit, so I basically quit buying Colts altogether.
On the other hand, I've got a pair of DWs, a 9mm Guardian and a .45 ACP CCO, and both run like raped apes. They're WAY more accurate than I am, and I can't get either of them to bobble no matter what I feed them. Both have gone through multiple range trips with 200+ rounds per trip with no maintenance, lube, or malfunctions, so, frankly, I'm perfectly OK with that. I don't give a shit if they'd go 2,000 rounds - because in the real world, through multiple deployments in multiple conflicts, I've NEVER had to run ANY firearm through multiple thousands of rounds with no maintenance or lube.
Quit worrying about a specific number or "challenge," and worry about what you shoot well that will get you through you're most stringent shooting need. For me, the worst abuse I've EVER given any pistol was shooting about 1,000 rounds per day for multiple days in training. But, I still had time to field strip, wipe the rails, relube, and pull a snake through the bore even on those days...