Unable to answer "What are the collection times of this Royal Mail postbox?" for https://osm.org/node/52682874 via StreetComplete 31.0:

The collection time is 9:00am monday to Friday, and 7:00am saturday.
However, the mailbox is in front of the left wall of the house n°39.
The number 38 should be visible on the last pictures. There's branch in front of the 39

Attached photo(s):
https://westnordost.de/p/33350.jpg
https://westnordost.de/p/33351.jpg
https://westnordost.de/p/33352.jpg