I am going to smoke a 12lb packer on my reverse flow smoker this weekend. I plan on wrapping at 160. I will try to keep the cooking temp at 225 in the smoker. I have read where a ballpark time per pound is 1 1/2 hrs. Is that figure based on not wrapping? What would it be roughly if i wrapped? Im trying to figure out when i need to put it on to have ready for dinner. Thanks