How much to cook chicken eggs?

How long does it take to boil eggs to be soft or hard boiled?
My experiment will help you find out how long it takes to cook eggs to reach a certain degree of doneness.
Different methods are possible: put eggs in boiling water or start boiling eggs in cold water. Cool eggs immediately in cold water, or leave to cool on their own, etc.
In my video, eggs begin to boil after boiling water and are cooled immediately in cold water. So that the eggs do not burst during the boil and are well cleaned of the shell, I added salt to the water. The category of C0 eggs was used for the experiment.

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Link to my YouTube channel:
https://www.youtube.com/channel/UCC53CBfhKXA5FbQhm01TQ2Q