On the topic of the world being made in 6 days, let us read from Genesis 1
Genesis 1:1-5
1 In the beginning God created the heaven and the earth.
2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
3 And God said, Let there be light: and there was light.
4 And God saw the light, that it was good: and God divided the light from the darkness.
5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Notice how the earth was created IN THE BEGINNING. It was without form and void and darkness was upon the face of the deep. This tells us that the initial creation of the earth was before God pronounces there to be light. The earth was also covered in water and had no land forms yet. This is what I take it to mean when God says the earth was without form and void. Notice that no light has yet been introduced so no day had transpired as of yet. Not until verse 3 does God introduce light upon the earth. He then divides the light from the darkness and calls the light day and darkness night. Only after introducing the light were we able to have the first day. So how long in "The Beginning" did it take before God introduced light? This is not known. But an even better question is, "What was the source of light in verses 3-5? It wasn't the sun because the sun was not introduced until the 4th day.
Genesis 1:14-19
14 And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:
15 And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.
16 And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
17 And God set them in the firmament of the heaven to give light upon the earth,
18 And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
19 And the evening and the morning were the fourth day.
The greater light that was to rule the day that God made on the 4th day of creation was the sun. So it was not until the 4th day that the sun was created. What then was the source of light for the days of creation? How long was a day according to this source of light? Perhaps it was according to God's time. Peter in his Epistle to the saints of his day says:
2 Peter 3:8
8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand
years, and a thousand years as one day.
Abraham 3:4
4 And the Lord said unto me, by the Urim and Thummim, that Kolob was after the manner of the Lord, according to its
times and seasons in the revolutions thereof; that one revolution was a
day unto the Lord, after his manner of reckoning, it being one thousand
years according to the time appointed unto that whereon thou standest. This is the reckoning of the Lord’s
time, according to the reckoning of Kolob.
Abraham 5:13
13 But of the tree of knowledge of good and evil, thou shalt not eat of it; for in the time that thou eatest thereof, thou shalt surely die. Now I, Abraham, saw that it was after the Lord’s
time, which was after the time of
Kolob; for as yet the Gods had not appointed unto Adam his reckoning.
Adam died at the age of 930 years. If one day unto the Lord is 1000 of our years. Then surely Adam died on the day (according to the Lord's time) he partook of the forbidden fruit.