multiple pork butts

[smokin stu]

I have been pretty consistent with cooking pork butts (1 1/2 hours a pound plus an hour for the smoker, with 8 hours of smoke - 200 to 220), and they are excellent.  How do I estimate the time if I put in two or even three butts at once? ???

I always FTC for 3-5 hours so a ball park estimate is all I need.

[icerat4]

Ive done 3 at one time in my original bs and the second and third one were lowered to the racks below as they got done.It took about 1-2 hours longer per each.this if for about 21 pounds of boston butt.Hope this helps ya out.