system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40K] How fast is warp travel?

Ideally, I would like to know how long it would take for a vessel with a good warp drive to cross the galaxy.
gpt
It seems random, honestly.  The ships have to ride the waves of psychic energy like a ship in a storm.  Some voyages cross the galaxy in weeks (such as when Chaos had the aid of the Gods) and some ships become permanently stranded (again, if the Gods see fit, like when Nurgle struck down the Death Guard).  Best case scenario, weeks.  Average circumstances, several years.