Never heard of such a thing!
I had planned for 3hrs 45mins!
But when I checked the internal temp at 2 hours it was definitely there!
1 1/2 early................ At 4pm instead of 6!!
Since it was so large and rotated closer to the burner than a regular roast/bird (my built in gas grill says 17 lb max), I had lowered the infrared to med/low. I realized that the temp inside the grill was low .......<250...... so I turned on an indirect burner to very low which brought the inside of the grill up to 325.
Screwed up my whole rhythm for the night. All the sides had to be rushed and by the time we ate, the turkey was cold and dry!
I have had success with the rotisserie for thanksgiving before and have never had it cook so quickly.