Mahabharata 12.326.104

भीष्म उवाच · bhīṣma uvāca

महाकल्पसहस्राणि महाकल्पशतानि चसमतीतानि राजेन्द्र सर्गाश्च प्रलयाश्च ह

mahākalpasahasrāṇi mahākalpaśatāni casamatītāni rājendra sargāśca pralayāśca ha

Our plain-language meaning of this verse is waiting for scholar review.