I'd like to trigger a device to turn off after 10 minutes

@Techno_Vol, there can be several reasons that restricted the presence being report from your mobile device to SmartThings. Many SmartThings users have commented the built-in presence from SmartThings might not update in time, and therefore prefer the Life360 app. You can find the related information in this article including the community developed Life360 device handler and smartapp.

You can also find the example in the thread how to limit the rule to be executed only when after sunset.

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