Something I haven't seen many people talk about in PHM is the fact that Eridians probably don't have the same attitudes towards time as humans do. Think about it: Erid is an inherently dayless place, having an atmosphere that allows no light and thus no concept of day or night. We don't really think much about how our entire lives are structured around this cycle that Earth life has been experiencing for eons. Erid life has no concept of this at all. Eridian sleep schedules are somewhat irregular and not synced to each other (they can't be, not if someone always stays awake to watch). They don't track birthdays like we do, they can't unless they're paying attention to their solar cycle, which I'd expect is a relatively new thing for their culture. Maybe they base age on their near-perfect memories or how many layers their carapace has or how big they are, or experiences/accomplishments. They may have an idea of an Eridian year, if their planet has seasons or something like that, but I doubt it has a whole lot of importance to them.
I'd image having an alien who relies so heavily on cycles and repeated patterns in order to function normally would be mind-boggling to the Eridians. What do you mean it celebrates the exact day of its birth every so often, just because? Wait we need to program a reliable change in light levels to simulate its planet, which has almost no atmosphere? And we have to schedule any interactions we have with it around this cycle? Wait it tracks its age by the scientific year, not by life experience and physical aging?
Constantly being reminded that this guy Rocky brought home that saved their entire planet is, in fact, a complete alien.
