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I damn near had an aneurysm trying to figure this out, so first lemme preface it--I headcanon that Cybertron's planet orbits and rotates at a much, much slower rate than earth, which gives Cybertronians a different value of time as a whole. They find comfort in that they have so much of it, and so they don't value it nearly as much as we humans do. In short, they're incredibly bad procrastinators lol.
They value their age in terms of 'vorns'. A stellar cycle is the time it takes for their planet to make a round around the sun.
Anyways, here's the time units I'm using for Mad Bird whenever I reference them. (otherwise I'll mainly be using human references)
Cybertronian Units of Time: a Guide
…concocted by me, via:
Canon Definitions
Most Common Terms Used in Fandom (that I have seen)
Most Common Interpretations of Aforementioned Terms
Math That Makes Those Terms Make Sense Together
Filling in the Blanks With What Sounded Good (to me)
So essentially I began with Cybertronian units with explicit definitions in canon that are also widely used in fandom (ie. Vorn = 83 years, Joor = 6 hours, Groon = 1 hour). I then worked my way out from those and tried to keep to rough factors of 6/8/10.
Some terms that did have explicit canon definitions had to be slightly skewed from their value (ie. Breem: 8 → 6 minutes, Klik: 8 → 6 seconds) if their definition contradicted another definition that made more sense/fit better.
At any rate, obviously no one is obligated to use this standard, but canon Transformers content has been unfortunately… awful at establishing any universal units of time, their relationship to each other, or their equivalents to human units of time.
So this occasionally makes fanfiction an absolute nightmare for people like me with a crap memory who don’t want to constantly have to scroll through a thousand pages of the wiki to remind themselves what the hell a groon is.
So, naturally, I simply spent far too long whipping up this at-a-glance guide to keep track of it & on the off chance that the fandom might adopt it. ¯\_(ツ)_/¯