No, it is at the discretion of the administrative authority to determine how the procedure is to be conducted – it can decide whether an oral hearing should be held or not. Although parties can request an oral hearing, they are not entitled to one.
If an oral hearing is held, it must be scheduled in such a way that all participants have the opportunity to appear in good time and prepared. The appropriate preparation time naturally depends on the complexity of the matter to be discussed – the more extensive the subject matter of the proceedings, the longer the necessary preparation time. Except in exceptional cases, the minimum preparation time is at least two days.