Twenty-four thousand years.

If you were to count backward at the rate of one year per second, without stopping, it would take you more than seven and a half hours to reach the year of MA-1’s birth.

If you were to walk backward in time at the rate of one century per step, it would take you 240 steps.

If you think of each step as covering one human generation of roughly thirty years, 24,000 years encompasses approximately 800 generations of human ancestors standing between us and the people who buried MA-1.

Each of those 800 generations was a fully lived human life.