That is not a full-time job. If Oog decides he's going to spend 10 hours a day doing nothing but make stone axes for the 15 other men in the tribe, Oog is going

That is not a full-time job. If Oog decides he's going to spend 10 hours a day doing nothing but make stone axes for the 15 other men in the tribe, Oog is going to have a bad time. In a hunter-gatherer context, the men are hunting, fishing and fighting, while the women forage and manage the children.