By The Numbers - part the fifty seventh

And you think that your tin-can-and-string telephone is wonky. How about this:

Since the problem surfaced in November, engineers had been working to diagnose and resolve the issue, a tedious and lengthy process complicated by the fact that it takes almost two days to send and receive information from Voyager 1, which was the first man-made object ever to enter interstellar space and is currently more than 15 billion miles from Earth.
[my emphasis]