From this verse (CC Madhya 20.320) it can be calculated that in one month (30 days) of Brahma’s life there are 420 manvantara-avataras and that in one year (360 days) of his life there are 5,040 manvantara incarnations

Expressions researched:
"From this verse it can be calculated that in one month (30 days) of Brahmā’s life there are 420 manvantara-avatāras and that in one year (360 days) of his life there are 5,040 manvantara incarnations"

Sri Caitanya-caritamrta

CC Madhya-lila

From this verse it can be calculated that in one month (30 days) of Brahmā’s life there are 420 manvantara-avatāras and that in one year (360 days) of his life there are 5,040 manvantara incarnations. Thus for the one hundred years of Brahmā’s life, there is a total of 504,000 manvantara-avatāras. In addition, the Manus themselves are considered partial incarnations of the Supreme Personality of Godhead.

CC Madhya 20.320, Translation and Purport

“In one day of Brahmā, there are fourteen changes of the Manus, and during the reign of each of those fourteen Manus, an incarnation is manifested by the Supreme Personality of Godhead.

From this verse it can be calculated that in one month (30 days) of Brahmā’s life there are 420 manvantara-avatāras and that in one year (360 days) of his life there are 5,040 manvantara incarnations. Thus for the one hundred years of Brahmā’s life, there is a total of 504,000 manvantara-avatāras. In addition, the Manus themselves are considered partial incarnations of the Supreme Personality of Godhead.