2. The steaming time of swimming crab mainly depends on the size of crab. Usually, Portunus trituberculatus with a weight of about half a catty needs to be steamed for about 10- 12 minutes, and the larger one needs to be increased as appropriate, with a maximum of 15 minutes. After all, the swimming crab is not cooked if steamed for a short time, and it is not delicious if steamed for a long time.