Hi Flying Bull when my kids were small they loved Soft Boiled Egss and Toast Soldiers for breakfast. Now cooking a boiled egg to perfection is a life skill that takes effort and work.
I used to ,and still do, tell them that the factors that must be assessed are the temperature of the egg, the OAT and the QFE to determine the exact boiling time.
I would not like to test my theories on an egg at VFs altitudes!