Open sensor alert

Please add an option to get an alert when a sensor has been left open for an extended period of time. For me, I would set to 2 minutes. No reason for me to have a door left open for 2 minutes, and I want to be alerted. This is a simple and important feature. I can look at the app to see which door is open after I am alerted. Though it would be best if the base would announce: front door sensor remains open.