In space, where there's no sunrise or sunset to mark the passage of time.
Because of that, to standardize what counts as a "day," they decided on a total of 50 hours, using Earth units as the baseline. Naturally, this refers to a "galactic day," as each planet has a different length of day depending on its rotation speed.
Here, on the capital planet of the Meyers Star System—the fourth planet from its star—Fizzen—a full day lasts around 30 hours. The hours from 0 to 9 are considered "before dawn," 9 to 24 is treated as daytime, and from 24 to 30 is regarded as nighttime.
At the moment, it was 2500 hours in military time. That meant it was just an hour into the night. This was the most logical time for dinner. Just like what we were doing right now.
Still, one mustn't underestimate how extravagant a meal could be in a royal palace.
