On Holiday!

Would you rather a 4 day work week? Each day would be 2 hours longer, but then you could have a 3 day weekend, every weekend. The math works, because instead of 5, 8 hour days, it would be 4, 10 hour days, both equal 40 hour work weeks. Best of all this is not just some crazy idea I had, people are actually talking about it! companies benefit from the power saved from being closed down an extra day. They even tried this in Utah. They ran the experiment for 12 months and supposedly the companies saved around 13% on power by being closed the extra day, and on top of that, workers saved approximately 6 million dollars, by not having to buy gas or commute the extra day. This did worlds of good for the environment, and the worker's pockets. I was wondering how you would feel about a 4 day workweek? the 10 hour days are long, and some of the people who tested it in Utah did not like it as they couldn't find extended day care for their children. Any other ideas as to potential negative effects?