Thighs go for 3-4 hours at 210-220...
For any kind of chicken. I take it to 90% cooked.. then work on the skin....
If Im cooking in the horizontal, i bring the bird or parts closer to the hot spot to crispy up the skin. If Im cookin in the Bandera, I remove the waterpan and bring the food down to the shelf that was just above the waterpan. I'f im doing parts, they go skin side down when they move to the hotter part of the chamber.
I tried the "finish" on the grill a few times, didnt like it when i finished on the propane, cause the thighs tasted like grilled chicken.. the charring kind of masked the BBQ flavor.
For chicken parts, If Im not using the hot spot, and the wife wants the skin real crispy, my favorite way is to finish them in the very top of the firebox, with the lid closed and a small amount of hot coals going down below and far away.. Really crispys the skin up nice, without charring them and getting that grilled flavor. As long as the firebox is hot, that skin gets crispy brown in under 2 minutes.