Later, in 1996, Ross Sackett performed two distinct meta-analyses to empirically test Sahlin's view. The first of these studies looked at 102 time-allocation studies, and the second one analyzed 207 energy-expenditure studies. Sackett found that adults in foraging and horticultural societies work, on average, about 6.5 hours a day, where as people in agricultural and industrial societies work on average 8.8 hours a day. (https://en.wikipedia.org/wiki/Hunter-gatherer#Common_charact...) Sackett, R. 1996. "Time, energy, and the indolent savage. A quantitative cross-cultural test of the primitive affluence hypothesis". Ph.D. diss., University of California, Angles.