Cueball has added together all the runtimes of the Star Wars movies (episodes I-IX) and then calculated the exact time at which a message sent to Voyager 1 will have that exact duration in light speed delay. He announces this information to Megan and Beret Guy only seconds before it occurs, allowing him to signal the moment by saying "Now!"
Megan expresses surprise that the event isn't being celebrated with fireworks. Judging by the fact that she doesn't look up from her book, her surprise is insincere. Beret Guy breaks into song with the New Year's traditional "Auld Lang Syne".

This comic highlights a coincidental relationship between the Star Wars Episodes and the NASA Space Probe "Voyager 1", which most likely no one else has thought about, but most likely fitting well with fans of both xkcd and Star Wars.

The first Star Wars episode was released on 25th May 1977 only four months before Voyager 1 was launched on 5th September 1977. The last episode was released more than 42.5 years later on 20th December 2019 only three weeks before this comic.

That is approximately 20.6 light hours away. With the recently released last episode the total viewing time of the nine episodes is 20.35 hours (not including the two spin-off movies Rogue One and Solo).