Just did some back of napkin math, and assuming you wanted to transmit information half way across the world with a fiber optic cable at sea level that goes exactly where you want it to, it would go 12566 miles (2pi4000/2) @ 124,666 miles per second (2/3)c, or take ~.1 seconds.
If you transmitted data straight up 700 miles, and then around the constellation all at 700 miles elevation, and then back down 700 miles, it would need to go 16165 miles (700*2 + 2pi4700/2) @ 187,000 miles per second (1c), or take 0.086 seconds.
If you transmitted data straight up 700 miles, and then around the constellation all at 700 miles elevation, and then back down 700 miles, it would need to go 16165 miles (700*2 + 2pi4700/2) @ 187,000 miles per second (1c), or take 0.086 seconds.
This seems like pretty exciting stuff.