Can't have a violent revolution without people to revolt, and people to revolt against. So you can't have a violent revolution until you have society.
First human societies are believed to have developed between what, 12,000 and 9,000 years ago or so.
Catalhoyuk is one of the older known human settlements.
Dated to 9,000 years ago in Turkey.
http://www.catalhoyuk.com/
http://en.wikipedia.org/wiki/Civilization
The emergence of civilization is generally associated with the final stages of the Neolithic Revolution, a slow cumulative process occurring independently over many locations between 10,000 and 3,000 BCE, culminating in the a relatively rapid process of state formation, a political development associated with the appearance of a governing elite. This neolithic technology and lifestyle was established first in the Middle east (for example at G?bekli Tepe, from about 9,130 BCE), and Yangtze and later Yellow river basin in China (for example the Pengtoushan culture from 7,500 BCE), and later spread. But similar "revolutions" also began independently from 9,000 years ago in such places as Mesoamerica at the Balsas River[2] and in Papua New Guinea. This revolution consisted in the development of the domestication of plants and animals and the development of new sedentary lifestyles which allowed economies of scale and productive surpluses.
I was being fair and giving him an extra 2000 years of class struggle than probably actually existed.
Anyway
http://users.rcn.com/jkimball.ma.ult.../Primates.html
Approximately 1.8 million years ago, a new form, the ancestor of Homo erectus appeared in Africa. Over the next 300,000 years, the australopithecines and Homo habilis became extinct, perhaps because they could not compete with Homo erectus with its larger (as much as 1000 ml) brain. Although Homo erectus arose in Africa (where it is sometimes called Homo ergaster), it soon spread into Europe and throughout Asia ("Java man" and "Peking [Beijing] man"). By 300,000 years ago, H. erectus was extinct. Not until some 195,000 years ago do clearly modern humans, Homo sapiens, appear in the fossil record.
120,000 years is the minimum amount of time since homo sapiens diverged from homo erectus when you are comparing genetic distances by examination of base pair alterations between them.
What makes a homo erectus and what makes a homo sapien is a bit debatable, of course. And then there's the debate about whether you can divide early homo sapiens from modern ones.
One more point, the definition of revolution is the forcible overthrow of a governmental or social order.
Tribes have a social order, but no government, and thus tend to have no one to overthrow and definitely don't tend to fundamentally alter their social organization or structures if they were to have a chief that they killed because they didn't like his "rule" (chiefs rarely rule their tribes) so the entire premise that you can have a violent revolution against elites who hold wealth and extract resources from others before you have elites, and people who can have their wealth extracted, is a contradiction in terms.
The vast vast majority of tribes observed globally tended to work on reciprocity and concepts very similar to the Big Man of Polynesia
http://en.wikipedia.org/wiki/Big_man_(anthropology)
Big men do not have political authority in the sense that they can dictate to people to get things accomplished. Rather they are more like the organizer for group democratic decisions. Often they achieve this status by accumulating wealth in the form of pigs, sweet potatoes, wives and children, and then spread that wealth around the community so that people will support their choices when it comes time for political decisions, but all political decisions are still decided upon by the community and the Big Man has no official mantle, no official power in any way shape or form.
He can't order armies to march for him, he can't tax his neighbors, etc.