https://www.worker-participation.eu/national-industrial-rela... under Workplace Representation:

Trade union delegates (DS) have rights to paid time-off. The amount varies with the size of the plant or company: 50 to 150 employees – 12 hours a month; 151 to 499 employees – 18 hours a month; 500 employees or more – 24 hours a month. In companies with 2,000 or more employees, unions which are representative within the company can designate a central union delegate (DSC). He or she has the right to 24 hours paid hours’ time off a month, irrespective of the size of the plant in which he or she is employed. Trade union delegates, including central union delegates, are also able to use their time off outside the company, for example in industry-level negotiations and meetings. They have a right to meet employees during working time, provided this does not cause significant harm, and to leave the company in the course of their activities.