About 30 minutes.

According to the query on Jiuzhou Zui Catering Network, we learned that the surface of the thawed hairy crabs has been thawed, but the meat is still frozen at a low temperature. Moreover, hairy crabs require cold water to be steamed in a pot, so the steaming time is longer than that of live ones. Steaming hairy crabs takes a longer time. It takes about 30 minutes to steam the hairy crabs.