I had this installed on my old phone: https://f-droid.org/en/packages/com.mathi_amorim.emmanuel.metrictime/
Had the widget under the 24 hour clock. Got a rough feeling of how metric time translates to part of the day.
But I that made me slowly realise that the popularity of number 12 is not there without reason.
The fact that it is nicely divisible by 2, 3, 4 and 6 is probably a very big contributor to it's significance.
Which then made me wonder, would metric system factors of of 12 be even better than the current metric system that has factors of 10?
Why even 10? Just because we have 10 fingers and that made it easy to count?
There is so called DuoDecimal system: https://en.wikipedia.org/wiki/Duodecimal
Some cultures actually use it. In that case, counting oh hands is not done by raising and lowering fingers, but instead by having one finger on one hand used as a marker, while the sections of fingers on the other hand are used as a 1-12 table: