Unable to answer "What are the opening hours here?" – Katholische öffentliche Bücherei Weyer (Altes Rathaus Weyer) (Library) – https://osm.org/way/849475975 via StreetComplete 57.2:

14-Tage Rhythmus, nicht in APP abbildbar

Attached photo(s):
https://westnordost.de/p/210602.jpg