Okay so in the bible it says a day of God is a thousand years.
so that's ONE take on it.
Currently I am doing a massive paper on the parrallels of hinduism and biblical teachings.
Its simply too much to write it all here but I can tell you briefly that basically all ancient languages stem from sanskrit however their original meanings were also lost along the way..
a quick Example which is very easy to grasp is BALA (in Hinduism GOD [or god's brother who is simply an expansion of God]) then the name BA'AL evolved .. then it got changed to mean ANY kind of God ..eventually the Hewbrews DROPPED it because they didnt want the false Gods associated with their God... so God went "nameless" of course we all know about BA'AL in tyhe bible.
In a similar manner there are words such as AGE / AEON - which is translated by the WTS incorrectly - stems form the Sanskrit word YUGA... im not going into the entore emtymology of it right now would take to long just go with me on this OK?
There are 4 divisions of ages according to Hindi Shastra
In the Sophia of Jesus Christ - Jesus answers the questions of his disciples about the aeons and their meanings.
According to Hinduism we are in KAli Yuga - the LAST AGE of the cycle. Just as in the bible we read LAST DAYS / AEON / AGE
The Kali Yuga/Age started in 18 February 3102 BCE in the proleptic Julian calendar and will last for 432.000 earth years
I have previously promised to wite a topic on how revelations aligns with the end of Kali Yuga but to be honest Im very busy with UNiversity.
Btw BOTH shastra and revelation say at the END OF THE AGE that the Lord will come ON A WHITE HORSE . too many parrallels to wite here.
Back to the question of a DAY.
So how long is a day?
Someone said we dont know - but in Shastra all time is given as such:
"The rishis, measuring time, have given particular names to particular portions [of time]. Five and ten winks of the eye make what is called a Kastha. Thirty Kasthas make what is called a Kala. Thirty Kalas, with the tenth part of a Kala, make a Muhurta. Thirty Muhurtas make one day and night. Thirty days and nights form a month, and twelve months form a year. Persons well-read in mathematical science say that a year is made up of two solar motions, meaning the northern and southern. The sun makes the day and night for men. The night is for the sleep of all living creatures, and the day is for work. A month of human beings is equal to a day and night of the departed manes [ancestors who have gone on to the subtle worlds]. That division consists in this: the light half of the month is their day which is for work; and the dark fortnight is their night for sleep. A year (of men) is equal to a day and night to the gods [Devas or celestials]. This division consists in this: the half year for which the sun travels from the vernal to the autumnal equinox is the day of the gods, and the half year for which the sun moves from the latter to the former is their night. [Thus, an earth year is but a day for the Devas.] Calculating by the days and nights of human beings about which I have told you, I shall speak of the day and night of Brahma and his years also. I shall, in their order, tell you the number of years, that are for different purposes calculated differently, in the Krita, the Treta, the Dvapara, and the Kali yugas. Four thousand celestial years is the duration of the first or Krita age. The morning of that cycle consists of four hundred years and its evening is of four hundred years. [Note: This says celestial years, or years of the demigods on the higher planets. Such years are much longer than those of planet earth. So 4000 celestial years, with the morning or Sandhya of 400 celestial years and the evening or Sandhyansa, or intermediate period, of another 400 years equals 4800 celestial years or 1,728,000 human years.]
"Regarding the other cycles [or yugas], the duration of each gradually decreases by a quarter in respect of both the principal period with the minor portion and the conjoining portion itself. These periods always keep up the never-ending and eternal worlds. They who know Brahma, O child, regard this as Immutable Brahma." (Mb, Shanti Parva, 231.21-22)
Lets break this down simply:
This equals 4,320,000 human years, or 12,000 divine years, in one cycle of the four yugas together
1000 cycles of these yugas equals aChaturyuga at 12,000,000 divine years and 4,320,000,000 human years in one day of Brahma. The Creator.
Have fun with it :-)