You can also use automations now:
- Create a virtual or simulated switch or choose a light in your house for this purpose. You can name it “Reminder” for example.
IF door X is open for “y” minutes AND switch “Reminder” is “off” THEN switch “Reminder” turn “on” + turn it off after “z” minutes + Send Notification “door X is open…”
You can also add the ** precondition “location mode” = away, night or home**
In this way, it sends you the first notification after “y” minutes of being door open and the following every “z” minutes, if the door is still open
UPDATE: If when your garage door is opened the garage light turns “on” and goes “off” after x minutes, you can use that same light in the previous automation instead of creating a virtual one.
When the light goes out and the door remains open, it will send you the first notification and subsequent ones until it is closed.