A colloquial Zmee unit of time. Since a Watch is equivalent to 2 hours, a Watch-sixth is equals twenty minutes. It is often just called a Sixth.

Likewise, a Watch-third is close to forty minutes, and is just called a Third.

All Zmee water clocks are graduated into Sixths and Thirds, primarily because they have 6 fingers on each hand and their numbering system is duodecimal (or dozenal).

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