Large colonies can afford standardized clocks. Small colonies often cannot. Their timekeeping has to answer to specific repair cycles, climate demands, exposure limits, and communication opportunities that would look eccentric in a broader system.
This is why small Children of Luna settlements often produce the strangest calendars. They are not trying to be obscure. They are allowing the world itself to decide what counts as a meaningful interval.
The result can make them seem culturally alien even to related branches. In reality, their clocks simply reveal how local their survival terms have become.