The anthropological research that came up with 2-3 hours of work per day only looked at time spent away from camp gathering, hunting, and fishing. When you account for food processing, cooking, water collection, firewood gathering, tool making, shelter maintenance, and textile production the numbers go way up. 40-50 hours per week for a modern hunter gatherer tribe is the floor, and the numbers for a prehistoric hunter gatherer society likely looked significantly worse. Once migrations are taken into account (which is why they do 2-3 hours per day of hunting), the numbers really don’t look that rosy.

This compares to a floor of 50-70 hours per week for premodern agriculture. The other side of it is that many of our estimates for agriculture come from hierarchical societies where a significant fraction of the work performed every year was heavily taxed. It’s hard to disentangle how much work was performed for sustenance of one’s family or village compared to the greater societies development (noble extravagance and all).