Śrīmad-Bhāgavatam 3.11.19
చత్వారి త్రీణి ద్వై చైకం కృతాదిషు యథాక్రమమ్ ।
సంఖ్యాతాని సహస్రాణి ద్విగుణాని శతాని చ ॥ ౧౯ ॥
catvāri trīṇi dve caikaṁ
[chatvaari treeni dve chaikam]
kṛtādiṣu yathā-kramam
[kritaadishu yathaa-kramam]
saṅkhyātāni sahasrāṇi
[sankhyaataani sahasraani]
dvi-guṇāni śatāni ca
[dvi-gunaani shataani cha]
Word-for-word
catvāri
—
four
trīṇi
—
three
dve
—
two
ca
—
also
ekam
—
one
kṛta-ādiṣu
—
in the Satya-yuga
yathā-kramam
—
and subsequently others
saṅkhyātāni
—
numbering
sahasrāṇi
—
thousands
dvi-guṇāni
—
twice
śatāni
—
hundreds
ca
—
also.
Blended reading (Sanskrit + English inline)
catvāri trīṇi dve caikaṁ
catvāri
four
trīṇi
three
dve
two
ca
also
ekam
one
kṛtādiṣu yathā-kramam
kṛta-ādiṣu
in the Satya-yuga
yathā-kramam
and subsequently others
saṅkhyātāni sahasrāṇi
saṅkhyātāni
numbering
sahasrāṇi
thousands
dvi-guṇāni śatāni ca
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 Tretā millennium equals 3,600 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.
Purport
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 × 360, or 1,728,000 years. The duration of the Tretā-yuga is 3,600 × 360, or 1,296,000 years. The duration of the Dvāpara-yuga is 2,400 × 360, or 864,000 years. And the last, the Kali-yuga, is 1,200 × 360, or 432,000 years.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
The yugas starting with Satya are calculated by multiplying 1200 by four, three, two and one.
Satya yuga is four thousand devatā years and the sandhyās at the beginning and end of the yuga totally eight hundred years. Treta yuga is three thousand six hundred years, and the others are similarly calculated.
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Source: vedabase.io