The time it takes to steam corn varies depending on the variety and size of the corn. Generally speaking, the steaming time is between 15 and 25 minutes, 8 minutes after the water boils for sweet corn, 10 to 15 minutes for old corn, and 10 to 12 minutes for sticky corn. It is recommended that steaming for 15-20 minutes is optimal, or you can extend or reduce the steaming time as appropriate depending on the quantity. Steaming time varies depending on the variety and size of corn. Generally speaking, the steaming time is between 15 and 25 minutes, 8 minutes after the water boils for sweet corn, 10 to 15 minutes for old corn, and 10 to 12 minutes for sticky corn. It is recommended to steam for 15-20 minutes for the best, or you can extend or reduce the steaming time appropriately according to the quantity.1. Corn steaming takes 15-25 minutes.2. Corn is a common ingredient with more varieties, including glutinous corn, sweet corn, old corn, etc., with big and small heads, so the steaming time will be slightly different. Old corn is not easy to cook, should increase the steaming time. Fresh corn can be soaked in water for a while before steaming, and the steamed corn will taste better. Steamed corn can be cold water in the pot, steamed and smothered for a while, the taste will be more glutinous. 3, Chinese medicine believes that corn is flat, sweet, into the liver, kidney, bladder meridian, diuretic swelling, liver and gallbladder, spleen, seepage of dampness, regulating the stomach, kidney and heart, clearing the effects of dampness.