I am wondering , whether the dhruvaloka which was bestowed to Prince Dhruva by Vishnu is eternal or it will be there only for a kalpa.
Here are the quotes from Vishnu purana
A station shall be assigned to thee, Dhruva, above the three worlds; one in which thou shalt sustain the stars and the planets; a station above those of the sun, the moon, Mars, the son of Soma (Mercury), Venus, the son of Sūrya (Saturn), and all the other constellations; above the regions of the seven Ṛṣis, and the divinities who traverse the atmosphere. Some celestial beings endure for four ages; some for the reign of a Manu: to thee shall be granted the duration of a Kalpa. Thy mother Sunīti, in the orb of a bright star, shall abide near thee for a similar term;