"Of course, there was much more forest back then, and this would have made finding food easier."
And more dangerous! A proportion of the hunting group would have had to be on the lookout for big cats, bears and wolves fans.
How long does it take you to pick a couple of tubs of blackberries? A couple of hours? That's great if you can preserve them, but you can't gather a week's worth of berries and keep them fresh.
Wood collecting is very time consuming. You need big logs to keep a fire burning for a long time. Dead wood will burn too fast so you have to fell trees, chop them up and drag them back to camp. As Tombo says a big camp fire will burn a lot of wood in one evening. I think the figures are more likely to be 12 hours per day ...
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