Combining Work and Study
Foreign students with a residence permit in accordance with § 16 AufenthG may work 140 full or 280 half days per calendar year. In addition, you may work as a student assistant at universities without limitation. A permit for this is not needed. In general, gainful employment per semester should not exceed 20 hours per week, because contributions to the pension insurance would also have to be paid.
Student Assistant Positions at HTW Berlin are limited and are assigned on a competitive basis, at the earliest during the 1st semester of studies.
Comments and examples for whole and half days
With 280 half-working-days per year, this is virtually normal full-year employment. Half days are working days with up to 4 working hours (calculated without the breaks).
Keep flexible working hours: For example, if you work a total of 12 hours per week in a company for three days a week and are free to divide time, you can work two times three and one six hours, or three times four hours. In the first case a whole and two half days, in the second case only three half days are "consumed". In the first case, half a day is "given away" as a result. The working days should be planned so that no job opportunities are given away. It's better to work four hours instead of two and eight hours instead of five!
Alternative calculation
20 hours per week, no matter when you work = 2,5 days.
Semester Break
During the semester break, any job, no matter how many hours you work, will count as 2.5 working days per week.