My 6168 regenerated at 48 hours. I was plowing and running at 2300
RPMs. My first indication was a funny smell reminiscent of melting wires, so i stopped and then noticed the regeneration light on. There is also a light next to that one that comes on at the same time to tell you that the exhaust is hot. Other than that, I didn’t notice any loss of power, and I was working it pretty good.