Sometimes, it can take up to 10 to 15 minutes for the water in the kettle to cool after it has boiled.

The amount of time it takes for water to cool in a kettle depends on several factors, including the initial temperature of the water, the ambient temperature of the room, the size of the kettle, and the material it's made of. Generally, it takes around 2-5 minutes for water to boil in a kettle, and then it will take some time to cool down. Once the water reaches boiling point, it will take longer to cool down than if the water was cooled before it reached boiling point. It is also important to mention that, once the kettle is removed from heat, the water inside will continue to cool down. The rate of cooling off will depend on the insulation of the kettle and the surrounding environment.