How long does it take for bluetooth tracker to discover?

I enabled the bluetooth tracker because I can’t get my Orbi integration to work at all and it’s only discovered one device so far, an Echo in the basement - but the other devices within 10 feet of it haven’t popped up yet. I figure maybe it needs a good long while to poll everything.

device_tracker:
  - platform: bluetooth_tracker
    consider_home: 360
    track_new_devices: yes
    interval_seconds: 15