If I wanted to roast a pork butt at 215 deg F, how long would I do this for? In 600 pan, foiled, salt crusted on a rack.
I usually cook Pork Butt (or Boston Butt) for around 20 to 25 mins per pound
This link http://m.recipetips.com/kitchen-tips/t--907/pork-cooking-times.asp has a list of suggested cooking times.
I usually do my pork at around 160f to 180f. And would worry that cooking at such a high temperature would mean the meat would be over cooked on the outer parts before the inner part was cooked, meaning some of the meat might be quite tough.
If your pork is covered in foil during cooking, you are looking at roughly between 1 and 1.5 hours per pound if you are looking to make pulled pork, 30-45 minutes per pound if you are looking to slice it.
The most important thing to note is these are just guideline times, intended to aid in planning. You should begin checking your roast as you reach the low end of the approximate time window. For example, let's say you have a 5 pound pork butt which you are going to roast in the manner you have described. This means that if you are trying to make pulled pork, you will start checking your roast at the 4.5-hour mark. You will want a skewer or similar probe to slide in and out of the meat with zero resistance. Or if you are making sliced pork butt, you will start checking your roast at the 2.5-hour mark, and your probe should be met with some slight resistance.