questions about the intranquil spirit

hello, i know this spell has been mentioned a few times in this sub and i have read those posts. i was wondering, for those who have cast it, how did it play out and how long did it take to show effects? that is the part i have been most curious about.

i have watched a couple of videos about it and read a couple of articles online. if this has been answered too many times, i am sorry. thank you for answering!