In Rock more than a year in the lives of the Nihileafs passes for the sake of irony. So it goes. The comic is an absurd take on how unproductive and uneventful the lives of the Nihileafs are, more than a year passes and nothing happens during that entire time. Their companion finally decides it has had enough sitting around and must move on, while the Nihileafs have no such feeling and continue in their position for who knows how long (in my mind the rock knows the Nihileafs are sentient and that is why the rock makes the comment prior to departing). The stoic rock itself is revealed to be anthropomorphic in the last panel that it’s in, which previously looked like just a stereotypical small boulder. Not sure how the rock should look as it goes to leave, but in all likelihood the easiest thing to do would be to have it look like a humanoid rock (maybe something inspired by the rock monster in the movie Galaxy Quest). – Zachary