Hi, Yaroonix. If I'm not mistaken, it's because a movie has a specific concrete duration, whereas TV series episodes can vary in duration anywhere from a minute or so to as much as around 90 minutes.

The duration of the episodes at series level is a deprecated field that used to store the multiple durations of the episodes. It wasn't mean to store the duration of the series and, unless all the episodes have the same duration, it was impossible to use it to calculate the complete duration of the series.

Now, the duration of the different episodes is stored at the episode level, and the field at the series level can still be used if all the episodes have the same duration. Otherwise, it should be locked empty.

@Yaroonix said:

Hi. https://prolulubox.com/ As a user on TMDB, I can see if there's a run time available by going to the edit page but for non-registered users, there's no way to see the run time of a TV show. I wonder why it shows for films but not for a TV series?

Thanks.

Why does The Movie Database (TMDB) allow users to view the runtime of films but not TV series, especially considering that registered users can access TV show runtime information via the edit page? Is there a specific reason for this discrepancy in visibility between films and TV series for non-registered users, and could this be related to the way TMDB structures its data for these formats or a deliberate user experience design decision?

As indicated above, the duration of TV series is a per episode information. It is perfectly visible without being registered : https://i.imgur.com/OdSusR9.jpeg