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Mercedes Lackey's Valedmar series has established candles (of a specific although unexplained size) which burn steadily enough to be marked off and used for timekeeping. So "three marks" (that is, ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7989 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Mercedes Lackey's Valedmar series has established candles (of a specific although unexplained size) which burn steadily enough to be marked off and used for timekeeping. So "three marks" (that is, however long it takes the candle to melt down three of the marks carved or painted on the side) is three hours. I have never heard of measuring time in prayers (because people don't all speak at the same time and cadence — a New Yorker speaks much faster than someone from Mississippi), but if your fantasy world doesn't have Catholicism, you could also use poems. That would allow you to write the poem as an epigram or to open a chapter, which might also give you an opportunity for symbolism.