2. Steamed steamed buns in cold water for about ten minutes can be eaten. This is mainly because the first steamed bun is relatively small, so it is easier to steam. The second steamed bun is characterized by thin skin, so the thin skin will steam faster. So if you steam steamed buns at home at ordinary times. It can be done in about ten minutes. If it is steamed and quick-frozen, it can be cooked thoroughly in about seven or eight minutes.