We have 7 920's in service, we run a ton of B&W self mailers on colored paper. Just pulled one due some wacky stuff at 13.5 million. After 10-12 million the BELTS that drive the rollers start to go, but a few hundred dollars and you can keep it going another 2-3 million. As long as the machine run's well and no boards go, they last as long as you take good care of them.