Seven to twenty minutes. In the steaming process, the carp weighing three catties is divided into big fire steaming, and small fire steaming is finally stuffy. Under normal circumstances, the fish can be steamed by big fire steaming for 7- 10 minutes. Because different people eat different tastes, the steaming time is long and short. After steaming for 20 minutes, the fish can be steamed thoroughly, and the fish will soon become scattered. Therefore, the steaming time of the carp weighing three catties is controlled at 7-20 minutes. To steam carp, it is necessary to master the steaming time, steam it for 15 minutes after the water in the pot is boiled, and stew it in the pot for 5 minutes after the fire is turned off, so that the fish meat is smooth.