The internal NMDeviceWiFi scan logic works like this:

It's minimum interval is 20s.  It's set to this when the device first
becomes ready or the device_state -> DISCONNECTED.

If the supplicant dies, it's set to 23s.

If an activation succeeds, the interval is set to 26s.
 
Every  time schedule_scan is called and the prior request to scan succeeded, 
the interval is incremented by 10s or 20s ( depends on the current device_state 
), up to a maximum of 120s.

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https://bugs.launchpad.net/bugs/1425172

Title:
  Network indicator lists the non-exist AP (timeout for the AP to be
  removed is too big, ~6min)

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