Starting with Genesis 5:3, we can add up the generations from Adam to Shem, Genesis 5:32, Then we can turn to Genesis 11:10 to Genesis 11:26 and go from Shem to Abram (Abraham). Thus the number of years between Adam and Abraham seems to be specifically given in scripture for the first 20 or so generations. And if we divide the total (about 2000) by 20 we get an approximate average generation duration of about 100 years.
Then if we consider the 40 generations from David to Jesus over the 1000 years we get that part of our answer at about 25 years.
And if we take the average between the two (about 62 years) for the about 12 generations from Abraham to David, we get another about 745 years. If we add them all up, (2000 + 745 + 1000) and use 2000 from Jesus to today, the total is about 5,745 years since Adam was created, which of course is less than 7000 to allow for errors and omission, since we were not there and therefore do not know..
If you count the times the kings reigned and the Judges it was about 800 years between Jericho and Daniel. We know from Daniel it was between 500 and 600 years until Jesus. Israel was in Egypt 400 years. Between Abraham and Joseph was about 200 years.
So Israel had roughly 1400 years in the Promised Land. It has been 1993 years from the Cross. Abraham lived about 500 years after the Flood. It would have been about 2000 years from Abraham to Christ without going into Egypt. And God did say 400 years would be 4 generations.
"And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years; And also that nation, whom they shall serve, will I judge: and afterward shall they come out with great substance. And thou shalt go to thy fathers in peace; thou shalt be buried in a good old age. But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full."
Adam was not created on the day the Garden was planted.
The Garden was planted after the Day of the Lord that God called a Sabbath Day of rest.
Seth was born 130 years after Adam was placed in the Garden. So the Flood was about 1500 to 1600 years after Adam was placed in the Garden. Methuselah died the year of the Flood
"And Enoch lived sixty and five years, and begat Methuselah"
Methuselah lived 969 years. You just have to add up the years from when Seth was born until Methuselah was born and add 969 years.
If you want to to know the specific amount of years a Day of the Lord lasts, listen to Peter in 2 Peter 3. You don't need to remain in ignorance. Jesus gave the history of earth within the 10 Commandments. God told Israel to Remember the Sabbath Day. It was a Day of the Lord.
There were multiple generations during that first Day of the Lord. Unless you seperate Adam from those created on the 6th day, Adam was a son of God created on the 6th day. Adam was placed in the Garden after that first Day of the Lord. There was no sin and death in that first Day of the Lord. But no one Remembers the first Day of the Lord. Evidently not even Job. There have been almost 6 days since Adam disobeyed God. But that was not the first day. That was the beginning of the second day when Adam disobeyed. Sin was the punishment for 6 days, because that was all the time God spent creating earth. God took six days to create the earth then rested for a Lord's day. Then 30 years after God placed Adam in the Garden, Adam disobeyed God. Jesus was 30 years old when He obeyed God in baptism.
When Adam disobeyed, God punished the earth with 6 Lord's Days. Then there would be a Lord's Day of rest without sin and death.
"Remember the sabbath day, to keep it holy.
Six days shalt thou labour, and do all thy work: But the seventh day is the sabbath of the Lord thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates: For in six days the Lord made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the Lord blessed the sabbath day, and hallowed it."
God did not rest for 24 hours. God rested for 1,000 years and then planted the Garden of Eden. Then Adam was placed there 1,000 years after he was created. That is the length of a Lord's Day.
"And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made. These are the generations of the heavens and of the earth when they were created, in the day that the Lord God made the earth and the heavens,"
Generations are plural, the Day was singular. The time was 6 literal days plus 1,000 years, so to God a Day, and a few seconds.
For a thousand years nothing sprang up out of the ground wild nor domestic. Nothing died, and the seeds and fruit was what every other creature on land and sea ate. So there is no way to carbon date nor radio date the earth accurately. There was literally no evidence of death and decay for 1,000 years. Only after Adam disobeyed could time literally start when it comes to keeping an accurate date from decay. And no, if one could not convince anyone in Job's day what actually happened, no one would believe that 4,000 years later. God changes how such dating is controlled. At the time of the Flood God changed the days of humans from thousands of years to 120 years. Then again, that was changed in David's day to 70 or 80 years. So the rate of decay would be evident in the lifespans of humans themselves. According to humans life expectancy was only 35 to 40 years in the first century. Of course modern humans think that life keeps getting better and better since the beginning. God declares the total opposite.
