However: this cannot be your normal working hours. That means: you shouldn’t always work so many hours.
After 6 hours of work, you must have a break of at least 30 minutes.
Once a week, you must have a break of 36 hours.
In most industries (for example on construction sites, in cleaning, gastronomy, etc.), there must be a break of at least 11 hours between two working days. These are the rest periods (Ruhezeiten).