The recommended boiling time for self-heating rice is typically around 5 to 7 minutes. This duration ensures that the rice is fully cooked and heated to the appropriate temperature. The exact time can vary slightly depending on the rice's brand and the size of the portion, but the general guideline is to boil the rice for about 5 to 7 minutes after it reaches a boil.

The reason for this boiling time is based on the heat retention properties of self-heating rice. These products are designed to heat the rice to a safe and enjoyable temperature using a chemical reaction that generates heat. The rice is usually pre-cooked and then packaged in a way that allows it to be reheated quickly. When you add water to the rice, the chemical reaction begins, and the heat is released, which then cooks the rice. The boiling time is sufficient to ensure that the rice is thoroughly heated and cooked without overcooking or becoming mushy.

According to a study published in the Journal of Food Science, the ideal temperature for consuming rice is between 135°F and 165°F (57°C to 74°C). Self-heating rice products are designed to reach and maintain these temperatures within the 5 to 7-minute boiling time frame. This ensures that the rice is both safe to eat and retains its texture and flavor. Additionally, the packaging and design of self-heating rice products are optimized to maximize heat retention and distribution, contributing to the efficiency of the boiling process.