Gate left Open

What’s the best way to create a flow to warn when my back gate is left open - I have an Aqara contact sensor on my gate, I have flows set up for notification when the gate is opened and closed. I want one of my hue lights to flash red when the gate is left open for more than 15 seconds. also if possible an alert (gate is open) to come through my HomePod mini.

When the gate is opened you start a timer with Chronograph app.
When closed you stop the timer.
If timer finishes you flash the light using transition timer in Chronograph app, and sends a push notification to your phone.

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