A day of Bramha consists of 1000 Mahayugas. Each mahayugas has four
yugas. They are
| Name of the Yug | Duration in Years |
| Krita or Satya | 1,728,000 |
| Dvapara | 1,296,000 |
| Treta | 864,000 |
| Kali | 432,000 |
Now if I have done my sums correctly, each mahayuga is exactly
4,320,000 years (or 4.32 million years) and therefore a day of
Brahma is 4.32 billion years.
