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Wiktionary
working time

n. (context legal English) The period of time that an individual spends at paid occupational labor. Most countries regulate the working time by law, e.g. by stipulating a maximum number of working hours per week. Exact definition varies by the legislation.

Wikipedia
Working time

Working time is the period of time that an individual spends at paid occupational labor. Unpaid labors such as personal housework or caring for children/pets are not considered part of the working week. Many countries regulate the work week by law, such as stipulating minimum daily rest periods, annual holidays and a maximum number of working hours per week. Working time may vary from person to person often depending on location, culture, lifestyle choice, and the profitability of the individual's livelihood. For example, someone who is supporting children and paying a large mortgage will need to work more hours to meet a basic cost of living than someone without children of the same earning power. As fewer people than ever are having children choosing part time is becoming more popular.

Standard working hours (or normal working hours) refers to the legislation to limit the working hours per day, per week, per month or per year. If an employee needs to work overtime, the employer will need to pay overtime payments to employees as required in the law. Generally speaking, standard working hours of countries worldwide are around 40 to 44 hours per week (but not everywhere: from 35 hours per week in France to up to 112 hours per week in North Korean labor camps ), and the additional overtime payments are around 25% to 50% above the normal hourly payments. Maximum working hours refers to the maximum working hours of an employee. The employee cannot work more than the level specified in the maximum working hours law.