Unable to answer "What are the opening hours here?" – Löwengrube (Nightclub) – https://osm.org/node/7902484946 via StreetComplete 62.2:

Neuer Name: "Nachtschicht - Drinks and events"- kein Schild mit öffnungszeiten

Attached photo(s):
https://streetcomplete.app/p/325608.jpg