Very good way of making breakfast in camp. Not sure about 13 minutes. I would practice at home first. a Soft boiled large egg needs 4 minutes,hard boiled 8-10 minutes. If you put too many in together, the water temperature will drop a lot and you would need to bring it back to 100C before timing. I shudder to think how you would distinguish 40 different omlettes, each placed in the water at a different time:)