For example,
60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
7 day = 1 week
29-31 days = Month (approx.)
365/366 days = year
It’s like for the imperial measurement of distance, where 1 mile = 5280 feet…
Edit: just to clarify, I’m more or less keen towards any consistent, decimal-based measurement systems like base-10 or base-12.
Time measurements like heat, mass, length etc are arbitrary units. It is just that they are the oldest.
The Sumerians gave us our time standards and they loved base 12. So twelve hours in the day and 60 (5x12) minutes in the hour. Also 12 months in a year and 360 degrees in a circle.
The French actually tried to implement decimal time after the revolution but reverted back after 6 years or so.