The cooking time for a rack of lamb depends on several variables. These variables include the particular cut of the meat, the weight of the meat, and the specific cooking method used.
The cooking chart at recipetips.com categorizes the cooking times for lamb based on three cooking methods: oven roasting, grilling at high heat, or using an oven bag. It is assumed that the meat is refrigerated, not frozen. For example, oven roasting a 5 to 7-pound whole leg of lamb to medium-rare requires 15 to 20 minutes of roasting at 325 degrees F. This will provide a safe internal temperature of 145 degrees F. Grilling 1 inch thick lamb chops to medium doneness takes approximately 8 minutes on each side.