This question is an exact duplicate of:
I have Aufenthaltserlaubnis and because of some personal reasons, I have stayed outside Germany (and EU) for more than 160 days.
I would like to enquire how many days I can stay out of Germany, in my visa category? Is it 180 days in a year (with multiple entries) or 6 months on a stretch, once you leave Germany?
This year, I have already stayed 160 days in total in my home country (outside EU), with multiple entries. So, do I need to enter Germany before 179th day? Or since I came to my home country on 20th August 2019, so I can stay for 6 months.