This is the second update on OWLT.

The clock is running now and the light time mechanic actually works. Type a “VERB” into UPLINK and the command takes 43 mission minutes to reach Jupiter.

None of that 43 minutes is invented. Both bodies are propagated on circular orbits and the separation comes out at 777 million kilometres and dividing by the speed of light gives 43:12. It drifts down by a second every eleven thousand mission seconds because Earth is closing on Jupiter at 27 km/s.