Matsya Purana — Cosmography of Jambūdvīpa: Varṣas
एकादश सहस्राणि वर्षाणां ते नरोत्तमाः आयुष्प्रमाणं जीवन्ति शतानि दश पञ्च च //
ekādaśa sahasrāṇi varṣāṇāṃ te narottamāḥ āyuṣpramāṇaṃ jīvanti śatāni daśa pañca ca //
Those best of men live according to a lifespan measured as eleven thousand years—(that is,) fifteen hundred years.
It does not describe Pralaya directly; it belongs to the Purana’s time-and-age framework, giving a specific longevity measure used in yuga/manvantara chronology.
By defining āyuḥ-pramāṇa (expected lifespan) within an age, it frames how long rulers and householders have to pursue dharma, artha, and mokṣa—an implicit ethical backdrop for governance and disciplined living.
No Vāstu or ritual procedure is stated in this verse; its contribution is chronological—useful for dating rites, dynasties, and yuga-based prescriptions elsewhere in the Matsya Purana.