What is the standard roasting time for a leg of lamb?

Standard roasting time for a leg of lamb varies from 15 to 45 minutes per pound based on weight, cut and desired doneness. A 5- to 7-pound leg requires 15 minutes per pound to achieve medium-rare, while a 3- to 4-pound shank half requires 30 minutes per pound.

A boneless leg roast weighing 4- to 7-pounds needs approximately 20 minutes per pound to achieve medium-rare, while well-done needs 30 minutes per pound. A 3- to 4-pound shank-half leg of lamb requires 35 to 45 minutes per pound to achieve well-done, while a sirloin half of the same weight needs 45 minutes per pound.