It can happen that way! I’ve had it go the other way too!Not saying I did it right, but it took me 14 hours to cook two 8lb butts on a 18" WSM.
How did yours go?
Wrapping definitely will save you time to get thru the stall. So your time makes sense to me.Update, put them on at 11PM running 250. Hit 170 internal on the top one at 4:30AM and the bottom one was at 165 so decided to just wrap it as well. Top one finished at 7AM and bottom at 8am for a 8-9hr total cook time. The combined weight of the two was 15.78lbs bone in from Costco.