CC Antya 3.255
koṭi-kalpe kabhu tāra nāhika nistāra
“Anyone who does not float in this inundation is most condemned. Such a person cannot be delivered for millions of kalpas.
The kalpa is explained in the Bhagavad-gītā (8.17): sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ. One day of Brahmā is called a kalpa. A yuga, or mahā-yuga, consists of 4,320,000 years, and one thousand such mahā-yugas constitute one kalpa. The author of Śrī Caitanya-caritāmṛta says that if one does not take advantage of the Kṛṣṇa consciousness movement of Śrī Caitanya Mahāprabhu, he cannot be delivered for millions of such kalpas.