Can I use my 120 full days of work per year by working more than 20 hours a week at the university?

As a student in Germany with a residence permit, your right to work is generally limited to 120 full days or 240 half days per year. If you work more than 20 hours per week during the semester, these hours might be counted as full days, which would reduce your overall quota quickly. Additionally, certain jobs, like student assistant positions (HiWi), might have different regulations. It's always best to confirm your specific situation with the local foreigners' office (Ausländerbehörde) to avoid any issues.