20.305
kona kalpe yadi yogya jiva nahi paya
apane isvara tabe amse ’brahma’ haya
SYNONYMS
kona kalpe—in some lifetime of Brahma; yadi—if; yogya—suitable; jiva—living entity; nahi—not; paya—is available; apane—personally; isvara—the Supreme Lord; tabe—then; amse—by His plenary expansion; brahma haya—becomes Lord Brahma "If in a kalpa a suitable living entity is not available to take charge of Brahma’s post, the Supreme Personality of Godhead Himself personally expands and becomes Lord Brahma.
PURPORT
One day of Brahma consists of the four yugas multiplied a thousand times-or, according to solar calculations, 4,320,000,000 years-and such also is the duration of his night.
One year of Brahma’s life consists of 360 days and nights, and Brahma lives for one hundred such years.
Such is the life of a Brahma.