system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When and why did the 'dozen' become a standard(ish?) quantity?
gpt
It’s divisible by 12, 6, 4 (quarters), 3 (thirds), and 2 (halves). This makes it much more useful for commerce than 10, which is can’t easily be divided into thirds or quarters.

Some early civilizations liked base 12 (as we call it) for this reason and is why the day and night each roughly have 12 hours.