4 Answers

Hi put eggs in a saucepan and cover with cold (tap) water. Put a lid on and put on stove.  As soon as the water boils set the timer for 6 mins. Take the lid off the saucepan or it will keep bubbling over. After 6 mins your eggs will be perfectly hard-boiled. Tip out the boiling water and cover eggs with cool water a couple of times so you can handle them.

I bet you thought this would be an easy answer, didn't you?  (I don't like hard boiled eggs but I would guess 13-15 minutes. 

The Hard Facts about Hard-Boiled Eggs

There are various factors that influence the amount of time it takes to hard-boil an egg:
Altitude
Size of the eggs
How many of them are being cooked together
How much water is used.

Answers.com contributors throw their hints into the pot:
At sea level, cover the egg(s) in cold water and bring to the boil. Leave on a rolling boil for 5 minutes and then turn the heat off. Leave the eggs in the water for a further 5 minutes, then crack them and immerse in cold water. This stops them cooking further and prevents the green coloration sometimes found around the yolk.

I live on the Southeast Texas coast, and have tried many different methods for hard-boiling eggs. The best for me is to cover the egg(s) with cold water. Over high heat, bring to a full rolling boil, and then turn the heat off. Cover with a tight-fitting lid, and allow to stand for 10 minutes. Complete cracking, chilling and peeling as in the first answer above.

You'll note that total time is the same as answer 1, BUT at only half the fuel consumption (therefore less use of expensive fuel, AND HALF THE GREENHOUSE GAS PRODUCED). I see no need to cook longer than necessary, and this method in this location, results in full cooking, including a hard yolk.

Put eggs in the pot with cold water. Bring to boil. Let boil for 1 minute. Take off heat, cover with lid. Let stand in water for 13 minutes. Remove and place in cold water to cool. Perfect every time.

For any size egg, I boil it for 15 minutes and that is it!

Cover eggs with cold water. Bring to a boil, cover, remove from heat, let stand 10 minutes. Drain. Shake eggs around in pot to crack the shells. Cover with ice cold water. Let sit in ice water for a few minutes, then peel. The ice water will shrink the egg away from the peel and make the eggs easy to peel.

Let water come to rolling boil. Place large or jumbo egg in the pot, boil for 20 minutes exactly. Remove the eggs from the pot and run them under cold water and peel the eggs immediately (this keeps the shell from sticking).

The best way to boil an egg is to place the egg(s) in the pot of water and bring to a full, rolling boil on high heat. Once the full boil is attained, REMOVE from the heat, cover with a tight fitting lid, and let stand for 24 minutes only.

Depends on how hard you like them, but 3 to 10 minutes is a "normal" range when the water is at a rolling boil. You can purchase an egg timer that goes into the cold water with the eggs and turns purple when the eggs would be ready.

About 15 to 20 minutes then you leave the egg in the fridge for 1 hour before peeling.

Bring water to full boil. Inset Eggs. Boil for NO MORE than 2.5 minutes. Keep Eggs in for 1 more minute. Remove Otherwise it gets hard and if you want to dip toast soldiers in there it will not work. You can let stand if you prefer to spread the egg as above. Leaving for hour etc in fridge is more to do with including egg in salad.

Cover it with COLD water. Don't plunge it into hot water or it will crack. Bring it to the boil, turn it down to a simmer and cook for a further 9-10 minutes.

http://wiki.answers.com/Q/How_long_does_it_take_to_make_a_hard-boiled_egg

It takes hardly 15mins to boil the egg.

3 for soft and 5 for hard, and the true test is to spin them on the counter, a soft boiled one doesn't hardly spin, a hard boiled one spins like crazy...