I don't think anyone posted 14 minutes yet so I will add that to the list.
I put cold water in the pan first, then eggs in single layer, then more water if needed to cover plus about an inch. Heat on Med-High flame until a soft boil starts, turn down heat to the lowest setting and cook 14 minutes, then rinse in cold water until the eggs stay cool when held.
My biggest pot no longer has a lid, so I keep the flame on real low instead of turning off and covering. Works the same.
I did crack two eggs (out of 4 dozen) because I walked away for a few seconds and they started to boil too much.
No green ring (yuck), it is harmless but ugly.