2, 10 minutes or so. Crab shell is more brittle do not need to steam for a long time, normal 3, 4 two a green crab only need to steam after the water boiled for about 10 minutes.
3, about 15 minutes. Generally larger, 6 two or so green crabs need to steam for 15 minutes after the water boils, or a one-time steam more green crabs, in order to fully mature, also need to steam for about 15 minutes.
4, 8 to 10 minutes. The length of time for steaming green crabs in a pressure cooker is usually a little shorter than in a regular pot, and it usually takes 8 to 10 minutes to mature after getting on the gas.