Dozens of miles away may probably mean distance of 50-100 km (and area of control of up to 31415 km^2). For hunter-gatherers it could be too energy-expensive to

Dozens of miles away may probably mean distance of 50-100 km (and area of control of up to 31415 km^2). For hunter-gatherers it could be too energy-expensive to travel that distance just to collect some raw materials for their tools. It will take more than a week for round trip, considering the time needed to get the food, and the location should be already known.