Wow, you got it done in 6 hours? Usually I can't get it tender until I hit the 10 hour'ish mark. Give or take.
It was a smaller cut of meat at 5 pounds. Temps were consistent at 250 degrees.
Might have been closer to seven hours but certainly no more. I had read to expect about 1.5 hours per pound. So it caught me by surprise too as it was done well before the planned 5oclock supper hour.
I let it rest, covered, in a cooler for two hours which worked out just fine.