Due to the known issue where iPhone presence is not reliable, I am using the iPhone WiFi Presence app. I have a rule that changes my phone's actual presence to Present if the WiFi virtual presence sensor changes to present, because obviously that would mean my phone is actually at my house. However, I don't want to to the opposite because there are other factors besides leaving the house that could cause the phone to disconnect from the network. So, what I am looking to do is set up a rule that sends a text notification to my phone if the WiFi presence sensor is Not Present for a certain number of minutes AND the actual (GPS-based) presence is Present. (I'm thinking something like 20 or 30 minutes.) This would remind me to go into the app and manually run the Goodbye rule which is supposed to run when all phones leave. (Or I just ignore the notification if I'm still at home and WiFi disconnected for some other reason.)
My question: Is there a way to have "presence is [state] for [length of time]" rather than simply "presence is [state]" as a trigger?