It is definitely worthwhile for students to take a look at the ordinance, because there they can also find out which deviating regulations the university is entitled to make. Especially the second part of the regulation should be of interest: "Regulations concerning studies".
§ 10 of the Corona Epidemic University Ordinance
§ 10: Standard period of study
(1) The individual standard period of study shall be increased by one semester for those students who are enrolled in a university course of study or in a course of study which is completed with a state or church examination in the summer semester 2020 and who are not on leave of absence, or who are admitted to such a course of study as a second student in accordance with § 52 section 2 of the University Act or § 44 section 2 of the Art University Act. The rectorate may stipulate that sentence 1 shall also apply to students on leave of absence.
(2) Section 1 shall not apply to courses of study which conclude with a state or church examination if the state regulations governing the general standard period of study for this course of study provide for an increase of this standard period of study by one semester for students or second students within the meaning of section 1.