Place the prime rib on a rack inside a roasting pan with the bones down. Mix together the olive oil with the seasonings in a small bowl. Rub the seasoning mixture on the …
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5 lb prime rib roast would take about 75 minutes, or 1 hour 15 minutes 6 lb prime rib roast would take about 90 minutes, or 1hour 30 minutes 7 lb prime rib roast would take about 105 minutes, or 1 hour 45 minutes 9 lb prime rib roast would take about 135 minutes or 2 hours 15 minutes
Generously cover all sides of rib roast with salt and pepper. Place roast in a roasting pan fat-side up. Arrange half the rosemary in the bottom of the pan around the roast. Roast 30 minutes, then reduce heat to 350º and cook 1 hour 30 minutes more for medium rare. (Plan on about 15 minutes per pound.)
“The Slow Roast Method for roasting prime rib is easy, hands-off, and foolproof. Roasting at a low temp ensures that the meat cooks evenly throughout, rather than with a well done exterior and a rare interior. This method also leaves you time to get everything else ready while the meat slowly cooks to perfection.” — Joan Velush
You can roast a prime rib with the rib bones still attached or you can have your butcher remove the ribs. Note that if you do this, he's going to weigh the roast first and then take the ribs off. In other words, you're paying for the ribs either way.