Here is the scenario:
You have 2 versions of the same movie, a director's cut and a theatrical cut.
Director's Cut is 2:14 with 18 chapters
Theatrical Cut is 1:48 with 16 chapters.
In the client UI (both web and Roku, and I assume all others), in the movie details page the time/length element, "Ends at" element, and all the chapters (number, thumbnails, etc.) are based on the 1st version alphabetically.
So, for our example, it would show a length of 2:14.