Hi Averythingcooks, I tracked down her recipe, there is a video on Food Network, it looks delicious!
Your question is about adjusting the cooking times, and sorry if this is a dumb response, but first you should make sure you have the correct cut of meat.
She calls for a "(7- to 9-pound) bone-in pork butt with a layer of fat on top". This is also known as a pork shoulder or Boston butt in the U.S., and I have never seen one weighing less than 2 1/2 pounds in the markets here. I think a boneless pork butt would also work for this recipe, but I would not use this slow-cook method for a pork loin or tenderloin.
I also noticed that she is cooking at 300 degrees, not 350.
If I were to attempt this, I think I would leave it covered for 1 1/2 hours, then finish it uncovered.