I would think they would get paid for the hours they worked.
Probably less, no company wants to pay for nothing.
I think most of the jobs in the world base pay on hours worked because it is the most common and easiest way to calculate value for services rendered. While some jobs work well on commission like Rooster stated, and some contract jobs can be "bid" for a specific project like roofing a home, the hourly wage is still the most common.
In a factory, on an assembly line, the amount of work a person does in an hour is a constant. If he works 8 hours, he will complete 80 widgets. If he works 6, he will complete 60.
Less. Unless the government is working double time to screw over the economy and companies