I remember it used to work for me, especially since I usually go to bed watching tv-shows, and waking up to my computer having gone to sleep due to no activity. Now-a-days Plex continues to play episodes forever.
According to https://support.plex.tv/articles/202605013-play-queue-post-play-screen/
"Auto-advance refers to the countdown timer on the Up Next item, which plays automatically once exhausted. It will be shown whenever there’s an Up Next item, except in the following circumstances:
If the user has opted out of auto-advance in the client preferences.
If videos have been playing without user intervention for more than two hours, and the video that just completed is > 20 minutes in length. In this case, the Up Next item will still be shown and selected such that a single click plays it.
These considerations are designed to try and make things work smoothly for users in as many scenarios as possible. For instance, these considerations should help:
- prevent having a whole television season get played through if you fall asleep"
I barely have any television shows below 20 minutes in length, and as an example last night it continued playing through an entire season and a half of Arrested Development while I slept, I surely hadn’t had any user interaction as I slept.