स यावदादित्यः पश्चादुदेता पुरस्तादस्तमेता द्विस्तावदुत्तरत उदेता दक्षिणतोऽस्तमेता मरुतामेव तावदाधिपत्यं स्वा-राज्यं पर्येता ॥ ४ ॥
In plain words
For as long as the sun rises in the west and sets in the east, and twice as long rises in the north and sets in the south, for that long does he attain the supreme lordship and self-sovereignty of the Maruts.
Close to the Sanskrit
For as long as the sun shall rise in the west and set in the east, and twice as much rise in the north and set in the south, so long will he attain the lordship and self-sovereignty of the Maruts.