Maybe only GOD knows, but, I found this:

http://www.religioustolerance.org/ev_bibl1.htm

My opinion about that is more like in here:

The "days" are of indeterminate length. They are to be interpreted like phases in a large construction project.

The "days" are not human days. They are God's workdays which can be much longer.

The Bible had to say things in a way that most people could better understand, after all, many things that are more or less known now or that we think that we now know, were not known before.

-------------

An example is that when we are told that GOD says that the time is near, that it is almost upon us, that might not mean that Christ is going to come back soon as we understand soon, but that Christ is going to come back soon as GOD himself understands soon, which can be a period of Thousands of Earth years or even much longer than that, only GOD himself would know for sure.

If we had also been "alive" for-ever, maybe for us "soon" might also mean Thousands to Billions of Earth years or much longer than that.

So what might be a "day" to GOD might not be what a "day" is to us.

Don't misunderstand me, I sure don't mean to say that the Bible is wrong, what I do say is that  the Bible is not wrong, the Bible is right.

Just that the words that were put down on the Bible might have been put down in that way so people or most people at any time of history and mostly in the old times would better understand, after all the only one who fully understands everything is GOD himself.

By the way, in the calendar the 7 and last day of the week is Saturday as Sunday is the first day of the week, so the day of rest should be Saturday and not Sunday, the Holy-Day and day of rest should be Saturday.

Now:

https://www.biblegateway.com/passage/?search=Genesis+2&version=NASB

The creation of Man.

Then the Lord God formed man of dust from the ground, and breathed into his nostrils the breath of life; and man became a living ^[f]being.

Again, only GOD himself would know if it was done exactly as it said here.

Well, it was really done exactly as it says here, but maybe not in a literal way, again don't misunderstand me, the Bible is never wrong, the Bible is always right, but things might have to be said in a way that people or most people will better understand.

I don't see science as being in contradiction to the Bible, I was going to say, the Holy Bible, but I think that only GOD, The SON and the HOLY SPIRIT are Holy.

I don't see contradictions, I think that people or most people just don't understand, the books of the Bible were written at a time or times when people didn't know and understand some of the things that we now know and understand and so maybe they were written in such a way that those people could better understand, after all even right now we don't know everything.

I repeat, I don't see contradictions between what is written on the Bible and science, I think that most people just don't understand.

Take a look at this:

https://www.blueletterbible.org/faq/don_stewart/don_stewart_1345.cfm

Why Did Jesus Speak in Parables?

Because it has been given to you to know the mysteries of the kingdom of heaven, but to them it has not been given . . . . And in them the prophecy of Isaiah is fulfilled, which says: 'Hearing you will hear and shall not understand, and seeing you will see and not perceive, for the heart of this people has grown dull. Their ears are hard of hearing, and their eyes they have closed, lest they should see with their eyes and hear with their ears, lest they should understand with their heart and turn, so that I should heal them' (Matthew 13:11,14,15).

-----

The Big Bang? Perhaps, Why Not? That doesn't mean that GOD didn't use "The Big Bang" to make creation with, big bang or not, GOD is the creator.

On the book of Genesis we see what appears to be a very simple explanation of how GOD made creation, but it was an explanation that people even then could better understand, after all, How much did people know back then? Even now we don't know that much, we just think that we do.

Simple words for simple people? Even now we are simple and we still have closed minds and hearts.

Even those who have 16 or more years of school don't understand as they have closed minds and hearts.

16 Or more years of school are not going to make you wise by themselves, it takes more than school.

It is written on the Bible that "Fear of The Lord is the beginning of wisdom"

https://www.biblegateway.com/passage/?search=Proverbs%209:10

Proverbs 9:10New International Version (NIV)