These went on the grill at 5:00 a.m and came off at 3:00 pm. They were coated in the house rub, which is mainly smoky paprika, chili powder, black pepper, and turbinado sugar. The temperature hovered between 225f and 275f.
At the 5 hour mark (after a bark had formed), I placed them in a disposable foil container, added a beer for steam, and covered with foil for the rest of the cook.
I had gotten up at 4 a.m. to start this cook, so I was exhausted by the time they were done. I was just glad they finished in time for my guests.
You can do this in a roaster pan with a rack in the oven, but you won't have the smokiness from the wood charcoal. Just remember to cover it after 5 to 6 hours so it doesn't dry out.