I'm with the above poster.
I've had butts stall unwrapped for hours and hours.
I'm keeping a detailed log these days - last butt I did for Memorial day was bone in, 6.25lbs trimmed and prepped.
I logged 8 hours on the WSM, average temp at the grate was about 260F, and the butt stalled twice, at 169F and 181F
I was hoping to do a full smoke and cook unwrapped, but time was ticking away, so I pulled it and wrapped it, in the oven at 300F and it pushed thru the stall to 203F in 1 hour. I went to 300F cuz the planned dinner time was racing at me fast.
But I did budget a full hour of resting before pulling/serving.
Here is a pic (bone came out easy and clean, bark was acceptable)
Not the best butt, but the family rating was a solid 8.0 for taste and tenderness (I always have the family give me a grading after dinner).
Wrapping always help me get past the stall, how fast will depend on the thickness of your cut and the temp of your cook.