Every year the 7 million employed people in the Netherlands work over 20 billion euros worth of unpaid overtime, according to a study TNO did on behalf of union FNV. On average Dutch employees work three hours of unpaid overtime per week, worth an average of 3,200 euros per employee per year, NU.nl reports.

Highly educated employees are the most likely to work overtime without pay. Nearly 74 percent indicated that they do just that. Among employees with a lower education, 29 percent work unpaid overtime.

Instead of all the overtime hours, FNV would like to see employers hire more people. According to the union, the extra hours can amount to 300 thousand additional full-time jobs.