Caitanya-caritāmṛta 20.323
ananta brahmāṇḍe aiche karaha gaṇana mahā-viṣṇu eka-śvāse brahmāra jīvana
[ananta brahmaande aiche karaha ganana mahaa-vishnu eka-shvaase brahmaara jeevana]
Blended reading (Sanskrit + English inline)
ananta brahmāṇḍe aiche karaha gaṇana mahā-viṣṇu eka-śvāse brahmāra jīvana
“The number of manvantara-avatāras for only one universe has been given. One can only imagine how many manvantara-avatāras exist in the innumerable universes. And all these universes and Brahmās exist only during one exhalation of Mahā-Viṣṇu.
My note
Source: vedabase.io