how long do you boil an egg for it to be runny
1 If you are using large eggs, cook the eggs for 4 minutes, for a runny yolk and 6 minutes for a medium-boiled egg, where the yolk is only slightly runny.2  For medium sized eggs, reduce these cooking times by one minute. If you are using large eggs, cook the eggs for 4 minutes, for a runny yolk and 6 minutes for a medium-boiled egg, where the yolk is only slightly runny.