Sūta said: The duration of a yuga is calculated according to the divine reckoning. The first yuga is named Kṛta; thereafter comes Tretā and then Dvāpara and Kali. O men of holy rites, these are the (names of the four) yugas. Henceforth the number of years of each yuga which have been mentioned earlier in divine reckoning are now being counted according to human reckoning. The Kṛta consists of one million four hundred and forty thousand human years; Tretā of one million eight hundred thousand years; Dvāpara of seven hundred twenty thousand years and Kali of three hundred and sixty thousand human years. Thus the duration of the four yugas, without the period of junction and transition totals to three million six hundred thousand human years. If Sandhya periods are included, the set of four ages will consist of four million three hundred and twenty thousand years. A little over seventy one sets of four yugas—Kṛta, Tretā, Dvāpara and Kali—constitute a manvantara.[2] The number of human years in a manvantara are thirty crores six million and seven hundred and twenty thousand, O excellent brahmins. The period of a manvantara, according to this Purāṇa, is not more than this.