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To firm up at 100Â° it takes an additional 2 minutes (you can test this by dropping some egg yolk into boiling water in a freezer bag and observe, I just did that to verify my old numbers). So in this case you'll have 9 minutes for a hard boiled egg and around 5 for soft boiled. By then the time/temp equation has normalized and you'll see longer and longer spans between consistency changes. Custardy is about 5 minutes for a medium (Grade AA) egg. Secondly, my approach.
Let the water come to a rolling boil. Reduce the water to a rapid simmer: Lower the heat and let the water reduce to a rapid simmer. Gently lower the eggs into the water one at a time. Cook the eggs for 5 to 7 minutes: For 1 to 2 eggs, cook 5 minutes for a very runny yolk or up to 7 minutes for a barely-set yolk. For 3 or 4 eggs, add a few extra seconds to your timing.