The timescale of the Universe as given by Puranas. Though scientifically incorrect, the imagination of our ancient Indians is worth appreciating.
1 charana = 432, 000 human years
Satya Yuga = 4 charanas
Treta Yuga = 3 charanas
Dwapara Yuga = 2 charanas
Kali Yuga = 1 charana
Maha Yuga = one cycle of all four yugas = 4.32 million solar years
One day of Brahma = 1 kalpa = 1000 Maha Yugas
Brahma creates the Universe during his day (1 kalpa) and destroys it during his night (1 kalpa again).
The creation-destruction cycle continues the next day.
The maximum age of a Brahma is 100 brahma years. After which a new Brahma emerges and continues the cycle.