Hunter gatherer societies are theorized to have spent the majority of their time not working, which is partly why were evolved such a complex social dynamic. Hunters would patrol their territory and hunt, with mixed results on the hunting, and gatherers would spend a few hours gathering food. It didn't take much work to sustain their tribes.
I wonder how much that depended on the population density of a particular place vs its "carrying capacity". I imagine that our hunter gatherer ancestors who lived with more competing groups fighting over diminishing herds probably spent more time/risk defending their turf.
