On iOS the playlist duration is shown at the bottom of the playlist. This does not show on the desktop apps or on browser. It's valuable for folks that want to create playlists with specific lengths. EX: A jogger that wants to jog for 60 minutes.
Moderator Edit: Changing title for clarity
Thanks for the feedback for web and desktop @cnagy! We're always looking for ways to improve and this helps!
Hope to see you around community more. 🎧