The general consensus is that a ribeye should be cooked for 4 to 6 minutes per side or approximately 10 minutes total for a medium-rare (135 degrees F). Add a couple of minutes more per side for medium (140 degrees F), and an additional minute per side for medium-well (150 degrees F). However, cooking ribeyes in the method described in this post allows you to bbq the ribeye for a much shorter time because we're using a high heat setting and finishing the steaks in a hot cast-iron skillet.