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 x 360 or 1,728,000 years. The duration of the Treta-yuga millennium is 3,600 x 360 or 1,296,000 years. The duration of the Dvapara-yuga millennium is 2,400 x 360 or 864,000 years. And the last, the Kali-yuga millennium, is 1,200 x 360 or 432,000 years.