Do I have the right to breastfeed during working hours?

No, you do not have the right to breastfeed during working hours, but you do have the right to be absent from work to breastfeed your baby. While you are absent from work to breastfeed, you are not entitled to be paid by your employer. You can, however, apply for part-time parental allowance.
The right to take time off to breastfeed is not limited in time, which means that as long as the child is breastfed, you are entitled to leave.
You do not need to notify your employer in advance of your intention to take time off to breastfeed, but you must inform your employer of your intention to take time off. If you do not notify your employer, the absence may be considered unauthorized. The leave you are entitled to is the time you spend breastfeeding and the time you have to travel to and from work to breastfeed. To make this work for both the breastfeeding employee and the employer, the employee and the manager need to agree on a good solution.