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It would probably be more useful to study primitive tribes and see how long they sit per day to see what our bodies might be adapted to.

I also find it hard to believe that people can sit for less than 3 hours per day consistently, given commute times as well.

You'd have to be doing manual labor on your property from sun up to sun down and only sit from sun down until bedtime to get close to 3hrs.

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You're confusing self-reported sitting with objectively measured sitting. The paper mentions both, mentions the rather large difference, and the reported correlation with life expectancy is for self-reported sitting.

A person who self reports little sitting is just likely to have a standing or physical job. So this is a weak version of correlating physical activity.

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