Apologies for any confusion caused. The cooking time for boiling an egg can indeed vary depending on personal preference and the desired consistency of the yolk. The following is a general guideline:

- Soft-boiled eggs: Boiling an egg for about 4-6 minutes will result in a soft-boiled egg with a runny yolk and a semi-set white. This is often enjoyed with toast or as a topping for salads.
- Medium-boiled eggs: Boiling an egg for around 6-7 minutes will yield a medium-boiled egg with a slightly firmer yolk but still creamy in the center.
- Hard-boiled eggs: For a fully set yolk, boiling an egg for about 9-12 minutes is generally recommended. This results in a firm yolk throughout.

These time ranges may vary depending on the size of the egg and the desired final texture. If 15 minutes works for you and results in a preferred yolk consistency, then it is absolutely fine to use that timing. Ultimately, finding the perfect boiling time for your eggs may require some experimentation and adjustments to suit your individual taste preferences.
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