1, prawns usually take about 5-8 minutes to cook, so you need water to boil the pot. However, we should also distinguish the time according to the size of shrimp: 2. Generally, 20-30g prawns are boiled in hot water for 5 minutes. Generally, the shrimp available in the market is about 20 grams, generally not more than 30 grams. This kind of shrimp can be completely cooked in hot water for 5 minutes, not too short or too long, otherwise it will affect the nutrition and taste; 3, generally less than 20 grams/shrimp, boiled in hot water for 3 minutes. This kind of shrimp is not common, but it is also sold and the price is relatively cheap. If you cook this small shrimp, you can cook it in hot water for 2-3 minutes. It is recommended to cook for 3 minutes, so children and the elderly can rest assured. Shrimp, an arthropod living in water, belongs to arthropod crustaceans, and there are many kinds, including Antarctic red shrimp, green shrimp, river shrimp, grass shrimp, prawn, prawn and lobster. Shrimp has high nutritional value for dietotherapy, can be steamed and fried, and can be used as Chinese herbal medicine. Shrimp can be divided into seawater shrimp and freshwater shrimp according to different producing areas.