1. Generally, boiled eggs can be completely cooked in about 10 minutes. Generally, it is best to boil eggs for 6 or 7 minutes. If the egg is fished out, the surface of the eggshell will dry quickly, indicating that the egg has been cooked.

2. In addition, you can also use chopsticks to hold eggs. If you can successfully clip the egg out of the water, it means that the egg is cooked.

3. It should be noted that the time for boiling eggs should not exceed 10 minute. When eggs are boiled in boiling water for more than 10 minutes, a series of chemical changes will occur inside. The structure of protein becomes more compact, and it is not easy to contact with protein digestive enzymes in gastric juice, so it is more difficult to digest. Protein in eggs contains more methionine. After a long period of heating, it will decompose into sulfide, which will react with the iron in the egg yolk to generate iron sulfide which is not easily absorbed by the human body, resulting in more nutritional losses.