The Wissenschaftszeitvertragsgesetz (WissZeitVG) says:
Die Befristung von Arbeitsverträgen des in § 1 Absatz 1 Satz 1 genannten Personals, das nicht promoviert ist, ist bis zu einer Dauer von sechs Jahren zulässig, wenn die befristete Beschäftigung zur Förderung der eigenen wissenschaftlichen oder künstlerischen Qualifizierung erfolgt.
The fixed-term employment contracts of staff referred to in Section 1 (1), first sentence, who do not hold doctoral degrees shall be permissible for a period of up to six years if the fixed-term employment is for the purpose of furthering their own academic or artistic qualifications. (Translation by DeepL)
How are those six years counted? Suppose I am employed as a research assistant for the duration of the winter semester 2022/23 only and do not work in fixed-term jobs that fall within the scope of the law until winter semester 2028/29. Can I take another fixed-term job in 2028 because I haven't worked in such jobs for the total duration of six years yet? Or can't I take another fixed-term job in 2028 because six years will have passed since 2022?