Unifi device_tracker - some basic clarification please?

Can someone please confirm whether my understanding is correct…

The function of the Unifi variable, detection_time overlaps with the function of the Device Tracker variable, consider_home, and in fact they are cumulative?

So if you set,

detection_time: 60
and
consider_home: '00:02:00

the device will be home until it has not been seen by Unifi for three minutes?

Also,
I have seen the configuration variable, interval_seconds used in configs posted in this forum but I can’t find it anywhere in the docs. Would I be right in guessing that it is the time between the platform updates? If so what is it’s default value?