3 ms·

But then everything has to be based on those fractions, instead of just using the lower unit directly. I guess it's just a different approach.

• ZiiS 6y ago
  In the phisical world you much more often want to fit three things in a space/cut material into four equal bits.
  • boudin 6y ago
    I never had issues with cm/mm honestly. And half a milimeter is always a precision hard to reach with home hand tools, so the need to have 0.33 milimeters on a ruler is not there. Tools that reach that precision are in micrometers.
  • mattkrause 6y ago
    In a similar vein, degrees are conceptually a bit weird, but make it easy to spread things around a circle in many commonly-used configurations.