To hard boil an egg, you should follhow long to boil an egg for hard boiled eggsow these steps:

1. Place the eggs in a saucepan and cover them with cold water. Make sure the water level is about an inch above the eggs.

2. Put the saucepan on the stove over high heat and bring the water to a rolling boil.

3. Once the water has come to a boil, remove the pan from the heat and cover it with a lid.

4. Let the eggs sit in the hot water for about 9-12 minutes, depending on the size of the eggs and how well done you want the yolk to be. For a fully cooked yolk, leave the eggs in the water for the full 12 minutes.

5. After the desired time has passed, drain the hot water and immediately place the eggs into a bowl of ice water. This will stop the cooking process and help the eggs to cool down quickly.

6. Once the eggs are cool, you can peel them and enjoy them as a snack or use them in recipes.

Overall, the recommended time to boil an egg for hard boiled eggs is around 9-12 minutes.