Maha-Vishnu breathes out infinite universes in a single exhalation, demonstrating Krishna's transcendent creative power beyond all material conception.Listen — Srila Prabhupada Uvaca
Prabhupāda: yasyaika-niśvasita-kālam athāvalambya jīvanti loma-vilajā jagad-aṇòa-nāthāḥ viṣṇur mahān sa iha yasya kalā-viśeṣo govindam ādi-puruṣaṃ tam ahaṃ bhajāmi [Bs 5.48] [Brahmā and other lords of the mundane worlds, appearing from the pores of hair of Mahā-Viṣṇu, remain alive as long as the duration of one exhalation of the latter [Mahā-Viṣṇu]. I adore the primeval Lord Govinda of whose subjective personality Mahā-Viṣṇu is the portion of portion.] Kṛṣṇa's first expansion, second expansion, the third expansion. The third expansion, Mahā-Viṣṇu. So Mahā-Viṣṇu's potency is described in the Brahma-saṃhitā: yasyaika-niśvasita-kālam athāvalambya.
Niśvasita-kāla means the breathing period. Just abiding by the breathing period of that Mahā-Viṣṇu, jīvanti loma-vilajā jagad-aṇòa-nāthāḥ. Jagad-aṇòa-nāthāḥ means the supreme creature, created, supreme created creature, Brahmā. Brahmā is the principal supreme creature in each, every universe.
There are innumerable universes, and there are innumerable Brahmās also. You will find in Caitanya-caritāmṛta, it is quoted from Śrīmad-Bhāgavatam that one sometimes... It is called līlā, pastime, that Brahmā, when Kṛṣṇa was here on this planet, so Brahmā was very much proud that "Kṛṣṇa is now in the earthly planet, and this earthly planet is one of the innumerable planets under my control." Brahmā is the controller, is the primal, principal living entity in this universe, so he was little proud that "Kṛṣṇa is within my control." So therefore Kṛṣṇa, because He is Paramātmā, He knows everything, what one thinks, what one does. So Kṛṣṇa asked Brahmā to come and see Him. So Brahmā came.
Brahmā came. His doorman informed Kṛṣṇa that... Doorman asked Brahmā, "Who are you, please?" "Now, you say Kṛṣṇa that I am Brahmā. I have come to see Him." So when the doorman informed Kṛṣṇa that—in Dvārakā, when Kṛṣṇa was there as king—so Kṛṣṇa asked, "Oh, which Brahmā?
Which Brahmā?" The doorman came back again and informed that "Which Brahmā you are?" So Brahmā became astonished: " 'Which Brahmā?' I am the Brahmā. I am the supreme creature within this universe, and 'Which Brahmā?' " He was surprised, and he said, "Tell Kṛṣṇa that four-headed Brahmā." Brahmā has four head. So Kṛṣṇa called him, "All right, come on." So he came, and he offered his obeisances, and Brahmā asked Him, "Kṛṣṇa, my Lord, may I ask You some question?" "What is that?" "Your doorman asked me, 'Which Brahmā?' So does it mean there are other Brahmās also?" Kṛṣṇa said, "Yes, there are innumerable Brahmās. You are only four-headed.
There are eight-headed, there are sixteen-headed, thirty-two–headed, sixty-four–headed, hundred-twenty-eight–headed, and millions of headed. So all right, I am calling them all." So Kṛṣṇa called all the Brahmās, and by His māyā, Brahmā could see them, but they could not see this four-headed Brahmā, and each of them came and offered obeisances to Kṛṣṇa, and they asked, "My Lord, what can I do for You? You have asked me?" "Yes. I have not seen you for so many times, so many days, so I have called you." So they came, thousands and millions of Brahmā came, and offered obeisances, and they went away.
And this Brahmā, four-headed Brahmā, remained in the corner, "Oh, what is I am?" So this is Kṛṣṇa's creation. So here it is stated that yasyaika-niśvasita-kālam athāvalambya: "Only just abiding by the breathing period of Mahā-Viṣṇu, there are millions of Brahmās, they are living." And each Brahmā's period... That you have read in the Bhagavad-gītā: sahasra-yuga-paryantam arhad yad brahmaṇo viduḥ [Bg 8.17]. [By human calculation, a thousand ages taken together is the duration of Brahmā's one day. And such also is the duration of his night.] The Brahmā's one day means 4,300,000's into 1000. That is Brahmā's twelve hours.