[2muchcoffeeman]

Try any natural process bean, medium-light to light roast.

I don't understand what chemistry is going on, but I have personally roasted beans (I don't even work on this very hard, max power, wait for first crack, then eyeball it) and they will consistently take at least 14 days to start tasting good, and last for well over a month without much of the typically stale bean attributes. They degrade a bit, but still taste good.

My record for one of my own roasts is maybe 3 months. It may have tasted good for longer, but I brewed and drank it all. I've had some random washed ethiopians that took a long time to mature, but by and large natural processes really take a long time to mature and last a long time for me.