I've read through out the site that I should count on about 1.5 to 2 hrs/lb at 250. I purchased a Pork Butt last night which was only 4 lbs., so should this ratio hold true on such a small butt? Everywhere I've read it seems as though people are purchasing 7 to 9 lb butts. I really question the ratio because I've been cooking my spare ribs for 6 hours, which would be the low end of this butt. Any help/advice you have to offer would be greatly appreciated. Thanks.