The operating hours  represent the period when the building works at 100% of its capacity. If the building is opened during 8 hours at 50 % of its capacity, then the resulting operating hours are 4 hours.
Example A: Myatt Primary School
This school is opened normally 8 hours per day from Monday to Friday, which represents 40 operating hours. It is also opened 4 hours on Saturday for cultural events, and only half of the children are present. Therefore, the operating hours are 2 hours. The total operating hours per week amounts to 42 hours per week.