How many years were there from Adam to Noah's flood?
The timeline given places Adam around 4000 B.C. and Noah's flood around 2400 B.C., making 1600 years from Adam to the flood. This is presented in general terms, though it could be narrowed down year by year. The human race ran along for 1600 years before that next big event.
Les teaches that Adam is placed at about 4000 B.C., and the human race ran along for 1600 years until the next big event in God's timetable, Noah's flood. From the reverse side, the flood would be about 2400 B.C. He notes this is in general terms and acknowledges that one could narrow it down year by year, but in general terms Adam's race went 1600 years, up to 2400 B.C., and then came the flood.