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.irections. 1  Bring the water to a rapid boil. 2  add saltand keep it at a rapid boil. 3  Prick the bottom (wider end) of the egg with an egg pricker. 4  Immerse in the boiling water and boil for exactly 5 minutes. 5  Dash in cold water, crack & enjoy.