How to set up an alert for door left open >20 mins

I was really excited to get the garaget set up so I could set alerts to inform me when my kids have left our garage door open for an extended period of time. This inevitably happens in the winter and can lead to pipes freezing and other problems. I am struggling to see how to set this type of alert up… Can someone please point me in the right direction.

On the Alerts screen of the app, please look for the timeout alert settings. You’ll be able to configure a desired timeout with 20 minutes available as one of the options.

timeout alert notifies you only once. Is it possible to keep alerting every set interval until the garage stays open?