Question

What is the longest period in human history

Answer 1

Modern period is the longest period in human history.

Answer 2

Prehistory is the period before written history and early human migration in the lower palelithic saw home  which erectus spread across the 1.8 millions of years ago.

Then it has proper controlled byusing the fire obtain 800,000 year in the middle part of the Paleolithic 250,000 year go so it will be more comfortable for the modern human to get success in the part of the Africa.