Trouble is with boiled egg is how fresh they are a freshly laid egg 5 minutes and super market eggs 2.5 minutes. Put in cold water and bring to the boil from moment timing from the minute the water starts to boil 2.5 minutes for average eggs. IMO.
If I get fresh eggs Fromm my mates small holding I poach them as they hold together lovely in the water. if old egg get white shit all breaking up in the water. If frying and eggs are old the spread all over the frying pan