Maitreya said: O Vidura, the four millenniums are called the Satya, Treta, Dvapara and Kali yugas. The aggregate number of years of all of these combined is equal to twelve thousand years of the demigods

Expressions researched:
"Maitreya said: O Vidura, the four millenniums are called the Satya, Treta, Dvapara and Kali yugas. The aggregate number of years of all of these combined is equal to twelve thousand years of the demigods"

Srimad-Bhagavatam

SB Canto 3

Maitreya said: O Vidura, the four millenniums are called the Satya, Treta, Dvapara and Kali yugas. The aggregate number of years of all of these combined is equal to twelve thousand years of the demigods.

SB 3.11.18, Translation and Purport

Maitreya said: O Vidura, the four millenniums are called the Satya, Treta, Dvapara and Kali yugas. The aggregate number of years of all of these combined is equal to twelve thousand years of the demigods.

The years of the demigods are equal to 360 years of humankind. As will be clarified in the subsequent verses, 12,000 of the demigods' years, including the transitional periods which are called yuga-sandhyās, comprise the total of the aforementioned four millenniums. Thus the aggregate of the above-mentioned four millenniums is 4,320,000 years.