The time for steaming steamed buns depends on the size of the buns and the heat of the steamer. Generally, after boiling the water, put the prepared steamed buns into the steamer, cover the pot with a lid, and steam for 15-20 minutes over high heat. For larger buns, it may take longer to ensure the inside is cooked. Keep an eye on the heat when steaming the buns to avoid oversteaming them and causing them to become dry and hard. The best level of doneness is when a toothpick is inserted and pulled out cleanly with no adherents. This way the steamed buns will be tender and tasty.