This can vary depending on the size and power of the kettle, as well as the starting temperature of the water. On average, a kettle will take around 3-5 minutes to boil.

No, electric kettles are not designed to be used on the stove. They should only be used with an electrical outlet.

This depends on your personal preference and the situation. Kettles are generally faster at heating water than microwaves, but microwaves are more convenient for heating small amounts of water.

It is generally not recommended to put metal objects in a kettle, as this can damage the kettle and potentially create a fire hazard.

To descale a kettle, fill it with equal parts water and white vinegar and bring the mixture to a boil. Let the mixture sit in the kettle for an hour or two, then rinse the kettle thoroughly with clean water. Repeat the process if necessary.