You can ask "Alexa, Open Keep a watch", Alexa will ask you for a person's name and how much time you want to watch him for. After that, Alexa will respond at regular intervals by repeating the person's name and saying a message for that person till the time elapses. That's it. This is a trick kill that I created so that my kids would think that someone is watching them.
If you dont tell the time, Alexa watches for one minute.
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