Many of us have a general idea of time durations in the Srimad Bhagavatam.
Here is one instrument used to measure time that Maitreya referred to when answering Vidura’s question on time scales. Time Measuring Instrument and Method: A copper pot weighing six palas has a hole bored in it by a gold probe weighing 4 masas, measuring 4 angulas.The time it takes to fill up with water is a called a prastha. (I understand that it needs to be immersed in a larger container of water.)
Here are the articles I have written so far on time measurements in different periods.
Astronomical Instruments in Ancient India (includes time measuring instruments).
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