I've been running hardened brass dies for about a year now. The machine has been cleaned and lubed about once a week. So far, I've replaced a limit switch (My fault) and the spindle (also mostly my fault). I run the machine for 8-12 hours every day, and over night 3-4 days a week.
The machine has performed admirably, and as I've mentioned before, it competes with the $100,000 to $250,000 machines on the market.
yes, my die take anywhere from 5 to 15 hours to run, but they come out perfectly, and that run time is actually my fault: I got tired of breaking tools.
I now have a second Nomad 883 Pro on it's way I'll see if the new one is as reliable as the old one