The four yugas equal one yuga-cycle (divya-yuga)
The life of Manu = 71.35 yuga-cycles i.e. 308,232,000 years
We are now in the 28th yuga-cycle of the current Manu, Vaivasvata.
Fourteen Manus rule in one day of Brahma
Vaivasvata is the seventh Manu in this day of Brahma.
= 1000 yuga-cycles
One year of Brahma = 360,000 yuga-cycles
The life of Brahma
= 36 million yuga-cycles
= the life of the universe
= 311,040,000,000,000 years.