|Canto 6: Prescribed Duties for Mankind||Chapter 10: The Battle Between the Demigods and Vṛtrāsura|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 6.10.16
tataḥ surāṇām asurai
abhavat prathame yuge
tataḥ — thereafter; surāṇām — of the demigods; asuraiḥ — with the demons; raṇaḥ — a great battle; parama-dāruṇaḥ — very fearful; tretā-mukhe — in the beginning of Tretā-yuga; narmadāyām — on the bank of the River Narmadā; abhavat — took place; prathame — in the first; yuge — millennium.
Thereafter, at the end of Satya-yuga and the beginning of Tretā-yuga, a fierce battle took place between the demigods and the demons on the bank of the Narmadā.
Herein the Narmadā does not mean the Narmadā River in India. The five sacred rivers in India — Gańgā, Yamunā, Narmadā, Kāverī and Kṛṣṇā — are all celestial. Like the Ganges River, the Narmadā River also flows in the higher planetary systems. The battle between the demigods and the demons took place in the higher planets.
The words prathame yuge mean "in the beginning of the first millennium," that is to say, in the beginning of the Vaivasvata manvantara. In one day of Brahmā there are fourteen Manus, who each live for seventy-one millenniums. The four yugas — Satya, Tretā, Dvāpara and Kali — constitute one millennium. We are presently in the manvantara of Vaivasvata Manu, who is mentioned in Bhagavad-gītā (imaḿ vivasvate yogaḿ proktavān aham avyayam/ vivasvān manave prāha [Bg. 4.1]). We are now in the twenty-eighth millennium of Vaivasvata Manu, but this fight took place in the beginning of Vaivasvata Manu's first millennium. One can historically calculate how long ago the battle took place. Since each millennium consists of 4,300,000 years and we are now in the twenty-eighth millennium, some 120,400,000 years have passed since the battle took place on the bank of the River Narmadā.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness