I'm sure you're already read this somewhere, but you can crank up the heat and cook a butt in 6 hours with no ill effects.
No need to overnight it.
Rescued 22.5" OTS. SJS Mini-WSM. HEB briqs (rebranded Royal Oak). Pecan/Hickory/Cherry/Apple/Peach woods.
2016 Fuji Absolute 2.0 LE (for burning off all the great BBQ)