Thanks Pags...sorry for the confusion.
The "air" temp of the smoker is 230-240 (now reading 232) for most of the time with it spiking up occasionally into the 250s. The meat temp is slowing climbing...now at 159.
I'm just wondering if the air temp part of my Maverick therm is being strange.
It is not unusual for me to have almost a 20 hour smoke when I am doing just one butt.