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A seven-pound prime rib will take approximately three to three and a half hours to reach the desired doneness, but keep in mind that the key factor is the internal temperature, not the time spent in the oven. Once it reaches the target temperature, remove it from the oven.
The Importance of Resting
After cooking, allow your prime rib to rest for 30-45 minutes. This resting period is crucial as it helps redistribute the juices inside the meat, ensuring each slice is creamy and tender. While the roast rests, you can prepare your sides or sauces to accompany your magnificent cut of meat.