For some reason that concept has not caught on in the cubicle world.
However, maybe with some people actually thinking about cost savings, energy savings ... and workers wondering how they can claim more freedom ... the 4 day workweek might start gaining some popularity.
Check out this recent test by the State of Utah:
Four Day Work Week
the state of Utah actually tried this and had state employees take Friday off and work longer hours the other four days of the week. According to Scientific American the results were impressive: