Here is the chart, the size of the lamb and the air fryer will determine how long it will take to cook your leg of lamb.Rare:120 to 125 degrees F – center is bright red, and pinkish.Medium Rare:130 to 135 degrees F – center is very pink, and slightly brown.Medium:140 to 145 degrees F – center is light pink, and the outer portion is brownMedium Well:150 to 155 degrees F – not pinkWell Done:160 degrees F and above – meat is uniformly brown throughout