Verse 2.2.61

Sanskrit text, Unicode transliteration, Word-for-word and English translation of verse 2.2.61:

चतुर्-युग-सहस्रस्य तत्रत्यैक-दिनस्य हि ।
अन्ते त्रैलोक्य-दाहेन जन-लोकोऽधिगम्यते ॥ ६१ ॥

catur-yuga-sahasrasya tatratyaika-dinasya hi |
ante trailokya-dāhena jana-loko'dhigamyate || 61 ||

catuḥ-yuga–of the four ages; sahasrasya–of a thousand; tatratya–for the residents; eka-dinasya–of one day; hi–indeed; ante–at the end; trai-lokya–of the three worlds; dāhena–due to the conflagration; jana-lokaḥ–Janaloka; adhigamyate–must be entered.

At the end of one thousand catur-yugas (cycles of four ages), which equal one day of Brahmā, a cosmic annihilation would take place, consuming the three worlds with fire and causing even Maharloka to become hot. The scorching heat would force the great sages to move to Janaloka.

Commentary: Dig-darśinī-ṭīkā with Bhāvānuvāda

(By Śrīla Sanātana Gosvāmī himself including a deep purport of that commentary)

Śrī Gopa-kumāra continues, “One day of Brahmā is comprised of one thousand catur-yugas, and one day of Maharloka is equally long. Maharloka exists for the same duration as Brahmaloka. However, at the end of Brahmā’s day, when the three worlds below Maharloka are annihilated by fire emanating from the mouth of Śrī Saṅkarṣaṇa, Maharloka also becomes heated. At that time, Bhṛgu and the other maharṣis understand that night has begun. Fearing the heat, they go to Janaloka, which is situated above Maharloka.”