And more seriously:Wait… so the answer to this whole Discern Realities and searching for a secret door was addressed… in the book?!?!?
This is why I can take @AbdulAlhazred's comments seriously: they are based on having read the book, plus extensive actual play experience, that includes having to think about, in play, whether or not some declared action constitutes close study of a situation.
Whereas random conjecture that is not based on knowledge of the rules, nor on play experience, but is just projecting D&D play expectations onto quite different procedures of play, in my view doesn't add very much to our collective understanding of DW and how it plays.