The time it takes to hard-boil an egg can vary depending on factors such as the size of the egg, starting temperature, and desired level of doneness. Here is a general guideline for hard-boiling eggs:
Place the eggs in a saucepan or pot in a single layer. Add enough water to cover the eggs by about an inch or two.
Place the pot on the stove over medium-high heat and bring the water to a boil.
Once the water reaches a rolling boil, reduce the heat to low or medium-low to maintain a gentle simmer.
Simmer the eggs for about 9 to 12 minutes for a fully hard-boiled result. If you prefer a slightly softer yolk, you can reduce the cooking time to around 7 to 9 minutes for a more medium-hard-boiled egg.
While the eggs are simmering, you can prepare a bowl with ice water. This will be used to cool the eggs quickly and stop the cooking process.
Once the desired cooking time is reached, carefully transfer the eggs from the pot to the bowl of ice water using a slotted spoon or tongs.