I can think up two reasons why it wouldn't work in most situations. 1. Management will demand the same amount of productive gains from the work regardless of h

I can think up two reasons why it wouldn't work in most situations. 1. Management will demand the same amount of productive gains from the work regardless of how many hours work. So, if your workers work three 10 hour days for the week they'll still expect the equivalent they received from a regular 40 hour work week split up between five 8 hour days. This can cause more stress for everyone involved (management included which has to explain why the numbers don't match expectations). So, I can't see any work force universally signing off for such a deal let alone management buying into it themselves. 2. Such a work week would conflict with external clients/vendors which can/will not adopt the same work week, so there will be problems maintaining productivity for them as such. It may be as simple as staggering the work force's schedule but I can see this leading to hiring more workers for the same task which will increase the cost of doing business. So, it's going to be cost more until other firms adopt the same schedule.