Mahākalpas
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A mahā-kalpa is equal to 300,000 saras and one sara is the time required to exhaust the sands of the seven Ganges (each Ganges being 500 yojanas or 2250 miles in length, 2¼ miles in breadth, and 50 dhanus or 100 yards in depth), at the rate of putting 100 years for the removal of one grain of sand.
