Adam’s and his descendants ages at the times their children were born are all called out in extreme detail, making computation of the length of the genealogies mostly a rote task, except for those whose names were left out deliberately, but covered in the prophets.
The New Testament genealogies finish off the job up to the birth of Yeshua, which is a known date. The differences in the two NT genealogies is because one is of Joseph (irrelevent) and the other is of Mary.
But I’m not asking about Adam’s descendants. I’ve read (skimmed) that part like I skimmed the whaling chapters of Moby Dick. I was not trying to recreate the timeline when reading the Bible just as I was not interested in the minutiae of whaling when reading Moby Dick.
I’m asking how long was Adam in Eden before God created Eve. How long was Eve in Eden before her unfortunate encounter with the serpent? Seems that has a direct impact on the timing of creation, given that it happened between creation and today.