How well does telephone delay correlate to geographic distance?
It used to be that the telephone delay was due to the signal being sent through a geosynchronous satellite. These are a long way up and the signal took that long to get there and back.

Today delays through routing devices are more likely to be the cause of the pause.

Half way round the earth is about 20 million meters with light or signal travelling at 300 million m/s direct transmission delay would only be about .066 seconds. Of course your wiring distance may be a little different,