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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.
Cook. When I want a soft boiled egg I want the yolk soft and the white firm. The boiling time has a lot to do with your elevation. 5 minutes is perfect for an elevation of 1100 ft (330 meters) if you are nearer sea level decrease the boiling time if at a higher elevation increase the time.ook. When I want a soft boiled egg I want the yolk soft and the white firm. The boiling time has a lot to do with your elevation. 5 minutes is perfect for an elevation of 1100 ft (330 meters) if you are nearer sea level decrease the boiling time if at a higher elevation increase the time.