Markandeyapurana 53.5

53.5

manvantarapramāṇañca ityetat sādhikaṃ vinā /
aṣṭau śatasahasrāṇi divyayā saṃkhyayā smṛtam //

Mārkaṇḍeya spoke:
The duration of the Manvantaras has been declared to be the four yugas multiplied by seventy-one and a fraction.[1] Hear the duration of a Manvantara from me in human reckoning. Thirty times ten millions are announced, and twenty thousands, and sixty-seven lakhs[2] more by computation—this is the length of the Manvantara in human years, omitting the fraction: it is known to be eight hundreds of thousands and fifty two thousands more besides of years by the divine reckoning.