Can Alexa be requested to turn off after a requested time? e.g:-
Request music for 1 hour then stop?
These "Set or cancel a sleep timer" commands works for any playing media.
Also see: "Control music with your voice"
@Pete: Simple answer - try "Alexa, stop in 60 minutes" - works for me.
Anodyne replies are dictated. Moderation leads to termination of the concept of Freedom Of Speech.
My point was that; the answers to these questions are in the help pages.