Matsya Purana — Characteristics of Dvāpara and Kali Yugas
प्रवर्तते ह्यविच्छेदाद् यावन्मन्वन्तरक्षयः सुखमायुर्बलं रूपं धर्मार्थौ काम एव च //
pravartate hyavicchedād yāvanmanvantarakṣayaḥ sukhamāyurbalaṃ rūpaṃ dharmārthau kāma eva ca //
Indeed, without interruption it continues until the end of a Manvantara—bringing happiness, long life, strength, beauty, and the attainments of dharma and artha, and also kāma.
It frames time in Manvantaras and says the fruit of sustained merit continues up to a Manvantara’s end, implying cosmic cycles govern how long such results endure.
It supports the Purāṇic ideal of living by dharma while also pursuing artha and kāma in a lawful way—promising stable worldly well-being (health, strength, beauty, happiness) when righteous conduct is maintained without lapse.
No direct Vāstu or iconographic rule is stated; the verse functions as a general phala-śruti—affirming that uninterrupted observance (ritual/dharma) yields enduring benefits.