After one day of Brahmā, annihilation occurs during his night, which is of the same duration. At that time all the three planetary systems are subject to destruction.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तदन्ते प्रलयस्तावान् ब्राह्मी रात्रिरुदाहृता । त्रयो लोका इमे तत्र कल्पन्ते प्रलयाय हि
tadante pralayastāvān brāhmī rātrirudāhṛtā | trayo lokā ime tatra kalpante pralayāya hi
SB 12.4.3