The cooking time for an 8-pound prime rib in a Ronco Showtime depends on the desired temperature of the meat, but on average, it takes between 18-22 minutes per pound. In a traditional oven or grill, prime rib takes up to 4 hours to cook.
For those who are seeking rare prime rib, it should cook for approximately 18 minutes per pound with the Ronco Showtime. A medium prime rib should cook for 20 minutes per pound, while a prime rib that is well done should cook for 22 minutes per pound.
Prior to cooking the prime rib, it should marinate or receive a rub to add extra flavor. A common rub includes salt, pepper and garlic.