3 to 5 minutes for one ear, 5 to 7 minutes for two ears, and 9 to 12 minutes for four ears. corn on the cob can be roasted in its husk on the grill or in the oven. (the silk must first be removed, however, and the husk replaced after this is done). before roasting, soak the ear in water for about 5 minutes. then place the corn on the grill or in the oven. cooking times vary but range from 10 to 15 minutes on a hot grill or 20 to 30 minutes in an oven set at 350 degrees f. avoid corn that is sold in displays 