Voyager 1 and Voyager 2 are currently about 13.8 billion miles (22.2 billion kilometers) and 11.5 billion miles (13.5 billion km) from Earth, respectively. It takes more than 17 hours for light to travel from Earth to Voyager 2, meaning that mission team members have to wait a day and a half to see if their commands work.

Any Astronaut mission out there would have the same problem with communication.

And still going... VGR2 is 21.3 Billion km according to DSN Now... ***