Crab this usually refers to hairy crabs, general water boiling steam 15 minutes after the cooked. As for how long it takes to steam, it depends on personal taste, some people like the feeling of tender and silky meat, you can steam it for another 3-5 minutes; some people like the feeling of solid and heavy meat, you can steam it for another 10 minutes or so. Of course, hairy crabs specifically how long to steam depends on the fire and the number of crabs, general family consumption of 10 packages of the following, with cold water steaming hairy crabs 20-25 minutes is more appropriate, you can pick a crab to open the shell to see if the crab yolk / crab paste solidified lumps, it should be almost. Of course, it's best to steam them for more time and try to cook them as much as possible before serving, such as steaming them for about 25 minutes (the meat may be slightly older);~