PURPORT

In every day of Brahma there are fourteen manvantaras. The duration of one manvantara, the lifespan of one Manu, is seventy-one yugas, and each yuga is 4,320,000 years. Almost all the Manus selected to rule the manvantaras came from the family of Maharaja Priyavrata. Three of them are particularly mentioned herein, namely Uttama, Tamasa and Raivata.