It might vary from company to company. When we work as a part-time employee, most companies usually pay only for the time we work. It means that we don't get paid for the break time in between.
For example, if we work from 11:00 to 17:00 and there exists 1 hour break time in between, the companies will pay only for 5 hours rather than 6 hours.
Is there a special phrase to convey the meaning of "the amount of time for paid activities"?