In Brahma mythology, Brahma’s lifespan is described on a vast cosmic timescale.

 In Brahma mythology, Brahma’s lifespan is described on a vast cosmic timescale.

Here’s the traditional breakdown:

1 Mahayuga = 4.32 million human years

1 Day of Brahma (Kalpa) = 1,000 Mahayugas

= 4.32 billion human years

1 Night of Brahma = another 4.32 billion years

So:

1 full day + night of Brahma = 8.64 billion human years

Then:

1 Year of Brahma = 360 such days

Brahma lives for 100 Brahma years

That total comes to:

100 \times 360 \times 8.64\text{ billion years} = 311.04\text{ trillion human years}

So according to Hindu cosmology, Brahma’s full lifespan is:

311.04 trillion human years

At the end of Brahma’s life, the universe is said to dissolve in a great cosmic dissolution called Mahapralaya before creation begins again.