Very skeptical about these kinds of studies that claim great productivity gains by cutting work hours by significant amounts. What is the cut-off point here? Wh

Very skeptical about these kinds of studies that claim great productivity gains by cutting work hours by significant amounts. What is the cut-off point here? Why not make it a 3-day week and get even more productivity gains? Obviously, there are diminishing returns, what are they? And how do they differ per industry? I can tell you right now, the vast majority of jobs do require the current hourly investment (and then some). Are there industries that would see productivity gains from a 6-day or 7-day workweek (not that we want to change to that schedule - but it's worth a contrast)? Many businesses will pay out over time even though it means paying out 1.5x or 2x or even 2.5x base pay - they aren't stupid. Clearly, there is SOME benefit.