Brahma

"One day of Brahma is calculated at 4 billion 320 million years, and Brahma lives for one hundred years on this scale. Thus if appear in one day of Brahma, there are 420 Manus during one month of Brahma, and during one year of Brahma there are 5,040 Manus. Since Brahma lives for one hundred of his years, it is calculated that there are 504,000 Manus manifest during the lifetime of one Brahma." http://mail.vedabase.net/tlc/8/en1

5,040 x 100 or 504,000 Manus in the duration of Brahma's life

fourteen Manus covering 4,300,000,000 solar years