|Canto 3: The Status Quo||Chapter 11: Calculation of Time, from the Atom|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 3.11.19
catvāri trīṇi dve caikaḿ
dvi-guṇāni śatāni ca
catvāri — four; trīṇi — three; dve — two; ca — also; ekam — one; kṛta-ādiṣu — in the Satya-yuga; yathā-kramam — and subsequently others; sańkhyātāni — numbering; sahasrāṇi — thousands; dvi-guṇāni — twice; śatāni — hundreds; ca — also.
The duration of the Satya millennium equals 4,800 years of the years of the demigods; the duration of the Dvāpara millennium equals 2,400 years; and that of the Kali millennium is 1,200 years of the demigods.
As aforementioned, one year of the demigods is equal to 360 years of the human beings. The duration of the Satya-yuga is therefore 4,800 x 360, or 1,728,000 years. The duration of the Tretā-yuga is 3,600 x 360, or 1,296,000 years. The duration of the Dvāpara-yuga is 2,400 x 360, or 864,000 years. And the last, the Kali-yuga, is 1,200 x 360, or 432,000 years.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness