Average weekly working hours in the Netherlands 2018, by age

The source explains weekly working hours as follows: "The number of hours someone works in a normal or average working week." Furthermore, the source adds that "Weekly working hours are calculated by the average hours paid for a job divided by 52. The hours paid include hours leave, paid overtime hours and paid sick and study leave, but exclude reduction of working hours. Also the weekly working hours without overtime is been determined. The yearly working hours of a job is the average hours paid for a job a year excluded overtime hours and leave hours through holiday, reduction of working hours and general recognized feast-days. For the yearly working hours of a year of employment this yearly average is determined for a year of employment instead for a job. "