15-20 minutes is enough. Crabs of average size can be steamed for another 20 minutes after the water is boiled to kill all the parasites inside, and they will taste the most tender. However, if you encounter a particularly large crab, you need to increase the time as appropriate. When steaming crabs, you need to put cold water in the pot, so that the steamed crabs will have fresh and tender meat without any fishy smell. Tie the crab's legs with cotton thread to prevent the crab from running away; steam the crab with its belly facing upward so that the crab roe will not be lost.

15-20 minutes is enough. For crabs of average size, keep the water boiling and steam for another 20 minutes. It can kill all the parasites inside, and the taste is the most tender. However, if you encounter particularly large crabs, you need to increase the time as appropriate. When steaming crabs, you need to put cold water in the pot, so that the steamed crabs will have fresh and tender meat without any fishy smell. Tie the crab's legs with cotton thread to prevent the crab from running away; when steaming the female crab, the crab's belly should be facing up so that the crab roe will not be lost when the crab is cooked.