Doors had never been off...it took a bit of work, and using floor jacks to push the door up and off the hinges
And then to put them back on two a couple (three?) weeks?
I ended up needing to use an old, small screwdriver as a chisel to cut out the old bushings. I had new Delrin bushings to install after the metal bushings were out...but...
I needed to use a wire brush on a Dremel to clean up the pins on the doors
And I had to order Dremel sanding drums to fit in the hinges to clean them enough for the new bushings.
Now that's all done, it takes just a couple minutes each to take the doors off or put them on, but many hours to get to that point :)