Upvote:-2
It would depend on when you believe creation occurred. There are many Theistic Evolutionists out here (like me) that believe creation occurred billions of years ago. That does not mean that we don't believe that Adam and Eve were historical figures, just that they weren't the first humans.
In my view, Adam was the first Israelite and first prophet, not the first human. He was to represent humanity in a covenant with God, but failed. Eventually Jesus became the covenantal head of men and succeeded where Adam failed.
Anyway, billions of years between creation and Adam's fall.
Upvote:2
According to Archbishop Ussher, Adam and Eve sinned on the tenth day of the first month.
Se https://answersingenesis.org/adam-and-eve/when-did-adam-and-eve-rebel/
His reasoning was that Day 6 was labeled good by God as was Day 7 (the first Sabbath), so the Fall could not be that early. Seth was born when Adam was 130 years old, so it must be before that.
The Day of Atonement is on the 10th day of the first month in the Jewish calnendar. When God slew an animal to make clothes for Adam and Eve to wear, that was the first sacrifice of atonement. Thus the bishop reasoned that Adam & Eve must have sinned on that day and God therefore commemorated it with the institution of the festival.
This is logical but speculative. We do not know.
People who have answered this question on other sites also mention the command to multiply. Adam and Eve would be disobeying God if they did not try to have children, so in their sinless state they would have obeyed. Since Cain was born after the expulsion from Eden, we must consider how long Adam and Eve could abstain from sexual relations and remain in a sinless state, or how long two completely healthy people could have relations before the woman conceived. It could not be that long, probably a few months at best.