Matsya Purana — Division of Bhārata-varṣa
देवलोकच्युताः सर्वे महारजतवाससः त्रयोदश सहस्राणि वर्षाणां ते नरोत्तमाः //
devalokacyutāḥ sarve mahārajatavāsasaḥ trayodaśa sahasrāṇi varṣāṇāṃ te narottamāḥ //
All of them—fallen from the world of the gods—clad in splendid, silvery-white garments, those best of men endure that state for thirteen thousand years.
This verse is not about Pralaya; it describes karmic consequence—beings exhausting merit and falling from Devaloka, with a stated duration of thirteen thousand years.
It reinforces the Matsya Purana’s ethic that heavenly reward is finite; kings and householders should pursue sustained dharma (charity, protection, truthfulness, ritual duty) rather than relying on temporary Svarga-merit.
No Vastu/temple-architecture rule is stated here; the verse instead functions as a karmic-cosmology note about Devaloka and the time-span of post-heaven experience.