There are some instances of real data taking much more than 6,389 seconds to travel. Voyager 2 was contacted in November 2020[1], being at the time 18.8 billion km away from Earth. Light takes about 62,000 seconds or 17h25m to travel this distance… each way! Almost a 35-hour ping.

Voyager 1 is further away and still sending data, although I don't think that it has received commands for a very long time.

[1] https://www.forbes.com/sites/startswithabang/2020/11/04/voya...