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If the smoker is at 275F temp the whole time and you dont open it and the pork butts are not wrapped then estimate about 1hr 10 min a pound.
I hope this gives a general idea. Always add 4 hours to your time estimation so you guarantee its finished. If it finishes early then tightly double wrap in foil and then tightly wrap in 3 bath towels and it will be piping hot 4 hours later.
If the smoker is at 275F temp the whole time and you dont open it and the pork butts are not wrapped then estimate about 1hr 10 min a pound.
I hope this gives a general idea. Always add 4 hours to your time estimation so you guarantee its finished. If it finishes early then tightly double wrap in foil and then tightly wrap in 3 bath towels and it will be piping hot 4 hours later.