An employment relationship is concluded by signing an employment contract. Persons may be employed when they reach the age of 15 years. Full-time employment must not be longer than 40 hours per week, and you may work a maximum of 230 extra hours/overtime a year. If you work eight hours a day, you are entitled to a 30-minute break. You also have the right to annual leave; how many days you are entitled to is defined in the contract.
In the case of undeclared work (most often this is work without a contract and payment of wages in cash), immediately inform your integration consultant. Such work is illegal and subject to penal sanctions for both the employer and employee, and you may report it to the labour inspectorate.