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It is most likely 2 butts in the package, not one. They usually run between 8 and 10 lbs. For me, they take between 12 and 14 hours. What type of smoker are you using?
I don't inject or spritz. Pork butt has plenty enough flavor for me to not need injecting, and the collagen will break down and become tender with time.
A little sugar in the rub ensures you will get a good bark - spritzing just slows down the cook.
The reason is because heating dry allows the surface temperatures to be greater than if you are cooking food it in. This can be greater than what the enamel can withstand, both inside and out.
I originally was using a le creuset dutch oven for bread baking, but stopped once I saw that enamel...
I have a slow n sear. I've done beef ribs, brisket, and pork butt in the Weber and they turned out great. The new ones are even better with the removeable water pan. Another great accessory for high heat cooking on the kettle is the Vortex.
Those starters are great for getting coals started, but you should not have any food in the grill while they are burning - they give off a nasty aroma that can flavor the meat.
The first time I smoked short ribs I had a similar experience. I guess biting into a rib I was expecting the flavor like pork ribs, but taste was different so mental disconnect. Now I love them - basically like brisket on a stick.
But good advice not to spend too much$ on something you are not...
If you are going to cook them to 145, then don't have them cut to 2". Pork shoulder is very tough. Cut them thin, and then pound and/or marinate to tenderize.
The calculators on PMDC all use Flash so you need to have Flash installed on your browser and make sure it is not blocked.
BakersCalc seems a bit confusing at first, but is very simple once you've used it a few times. It has two basic operating modes that you select from the hamburger menu on...
I use these calculators that provide for a lot more variables
BakersCalc
Pizza Dough Calculation Tools - PizzaMaking.com - unfortunately those use Flash which is being discontinued. Hopefully they will convert them soon
I leave them on too - ribs turn out more moist. If you want, you can remove them after the cook. Some folks will burn them off on over high heat on the grill.
First of all, stop thinking about needing to get to a specific temperature. Just cook till tender - depending on a variety of factors, that could be much lower than 200F.
But, if you are able to maintain 225-250, then it probably won't take anywhere near 24 hours. It could easily be finished...