How long was the period from Adam to Abraham?
The period from Adam to Abraham was approximately 2,000 years, a time when God dealt with one race of people. The context also outlines sub-periods of about 600 years to the flood, 200 years to Babel, and 200 years to Abraham's call, which it calls the midpoint.
Les teaches that from Adam until Abraham, God dealt with one race of people for the first 2,000 years. He breaks the period down into approximately 600 years from Adam to the flood, 200 years from the flood to the Tower of Babel, and 200 years from Babel to the call of Abraham, which he places at the midpoint. During this era, there was no organized system of worship, no temple, and no written law; people related to God through conscience, bringing a blood sacrifice by faith, and it was their faith that saved them, just as faith saves today. The human race fell apart until God had no remedy but to destroy them, after which Noah and his three sons—Ham, Shem, and Japheth—began the split into three races.