After food has finished cooking on the stove, you should turn off the stove immediately. There's no need to wait any additional time once the cooking process is complete. Keeping the stove on after cooking is unnecessary and can be a safety hazard.
Leaving the stove on after cooking not only wastes energy but also increases the risk of accidents, such as burns or fires. Turning off the stove promptly after cooking is a good practice to ensure safety in the kitchen. Additionally, it helps prevent overcooking or burning the food if it's left unattended.
Always remember to be attentive and cautious when using the stove or any cooking appliance, and turn off the heat as soon as you're done cooking to ensure a safe cooking environment.