I am about to cook my first pork butt. This one is a doozie! It weighs in at 20 pounds. My advanced math skills tell me that I will be cooking this monster for 40 hours! No thanks. If I cut it in half and cook approximately 2 hours per pound, can I cook both halves at the same time and expect it to be done in about 20 hours, rather than 40? Do you suggest that I cook only half and freeze the rest raw, or will it freeze better after it is cooked?