[uptoolate]

The method used in Genesis 5 isn't susceptible to the missing generations theory. You are starting with a birth, and then you get a number of years until another birth. Doesn't matter who, how many, or even if in the same family. I've charted Gen 5 to show the years from Adam to Noah.

Not sure if there is work done like this from the birth of Noah's sons to an independently verified recorded historical point in time.

[uptoolate]

Actually chapter 11 takes us on Shem’s lineage,at the age of 100, using the same method as Gen 5 all the way up to Abram.

So we know how many years it was from the creation of Adam to Abram/Abraham.

1,556 from Adam to the birth of Shem, and 390 from the birth of Shem to Abram.

Adam to Abram = 1,946 years.