It takes approximately 4 minutes to boil a soft boiled egg and it is usually served in an egg cup. Sometimes soft-boiled eggs are eaten with buttered toast which is dipped into the runny yolk. Hard boiled eggs can be used in a variety of ways, but they also be eaten in egg cups. They should be boiled at least eight minutes to insure the consistency is hard. Hard-boiled eggs in their shells can be stored in the refrigerator for many days.