Just chiming back in with more accurate data, in case that can help. The
delay is currently 17 minutes. Could Google’s Nest servers be
experiencing delays due to increased ding-dongs on Halloween?
Just another post about the same problem noted above. 10-15 min delay in
getting the “Your camera spotted someone” notification on multiple
devices. Stable home internet with Google Wifi mesh network. All other
devices work fine.