Are you sure you don't have a Twin pack? Quite common in cryo packaged butts. Its in one pack and its one piece sawed into.
If you are not foiling, going low and slow, I would recommend 2 or 2.5 hours per pound on your butt, and I would be willing to bet you have two in that bag. Normally when I do a 9 lb butt, I expect a 20 to 22 hours cook.
My biggest suggestion to you, is do the butt a day or two in advance, pull, add some finishing sauce if needed and throw in the reefer till the party. Pull it out drop it in a crock pot heat it up, add some more finishing sauce if needed and you come out a hero. No tending the fire all night before the party, no cooking on the clock. See no one ever taught pigs to tell time so they can be a bit honery when expected on time.
If then you want something to smoke you know for the guys to gather talk and have a cool one, smoke something fast and simple, some sausage, pork shots, ABT's. It gives you something to play around the smoker with.
When you get a chance, please drop in the Forums to "Roll Call" so you can get official welcomes, the secret password and the secret handshake. It doesn't hurt too much really.
Also Click on the "My Profile" Icon on the above task bar and say as much or as little as you like, but where you sleep at night is important. People can see it and understand when you are in a discussion or looking for help, what kind of weather you are in.
Hope the above helps you, I know you'll enjoy your smoke. Just think about advanced smoking, its the pits cooking on the clock.
