How do I cook large quantities of Boston pork butt? I am cooking approximately 30 lbs of boston butt pork roast.  (one roast is a little over 15 lbs and the other is a little over 16 lbs)  Should I cook the roasts together in one big roaster at about 250 degrees or seperate them?  I am doing pulled pork for a crowd.  How long do you think this might take?

Thanks in advance for your advice!  :)
You can keep them together, but I would recommend budgeting a very long time for cooking. In my opinion, your better bet would be to slow roast them in the oven, with some air space between the two roasts. I would also consider cutting each roast in half. Four 7-8 pound pork butts will cook much faster than two 15-16 pound ones.