15-30 days.

Generally from the market to buy back salted duck eggs, basically are boiled, bought back after the need to use hot water at home to cook again. The salted duck eggs can be kept at room temperature for about half a month to a month, but if the weather is cold in winter and the temperature inside the house is low, the general preservation time is about three months. If the salted duck eggs are put inside the refrigerator for preservation, the general preservation time can be about five months.

Value of duck eggs

The protein content of duck eggs is comparable to that of eggs, while the total amount of minerals is much better than that of eggs, especially iron and calcium content is extremely rich.

Duck eggs pickled, still have good nutrition, rich in fat, protein and the human body needs a variety of amino acids, but also contains calcium, phosphorus, iron and other minerals and the human body essential trace elements and vitamins, and easily absorbed by the body.

Suitable for people with lung-heat cough, sore throat and dysentery. Salted egg yolk oil has the effect of bright eyes and eyesight, but also can cure children's food accumulation, external application can cure burns, eczema.

The above content reference? Baidu Encyclopedia - Duck Eggs, People's Daily Online - How to Eat Duck Eggs should be eaten Duck Eggs Nutritional Value