There are different type of works.
I can push boxes or clean a ship as long as I have strength, which is likely to be 10 hours.
I can't make productive decisions for 10 hours in a row. If you increase the amount of hours, you don't get more knowledge work done. You just get more meetings and useless fillers or procrastination.
All in all, I think dictating when employees work is stupid, exactly how it's stupid to pay a contractor per hour. You should always pay based on output, no matter when that output was achieved. On the contrary, you might even want to pay more if the desired output was achieved earlier than expected (and not pay less because he must have worked less hours).
Be ruthless on the output, don't bother about the hours.
I can't make productive decisions for 10 hours in a row. If you increase the amount of hours, you don't get more knowledge work done. You just get more meetings and useless fillers or procrastination.
All in all, I think dictating when employees work is stupid, exactly how it's stupid to pay a contractor per hour. You should always pay based on output, no matter when that output was achieved. On the contrary, you might even want to pay more if the desired output was achieved earlier than expected (and not pay less because he must have worked less hours).
Be ruthless on the output, don't bother about the hours.