How does automatic scanning/analysis of big photo libraries work?

I’ve just added a photo library with about 18k photos to Plex. It took 1 or 2 hours until the initial scan was done and since then it has been analyzing the files. The analyze is now already running for a few hours and it seems like it didn’t get very far yet because I’m still missing thumbnails for many of my photos.

How does Plex handle photo libraries during the scheduled maintenance? I’ve seen that there is an option for media analysis during maintenance and it’s enabled by default. I hope this doesn’t mean that the multiple hour analysis is running each night?
Because if it is running that each night, I’ll have a problem. And I don’t want to just disable the setting because I want it for the non-photo libraries.

Also, how does the setting “Run a partial scan when changes are detected” behave exactly? If I add a new photo to one sub (sub-sub-…) folder, does Plex only scan that one subfolder? I hope so, because otherwiese it will again take hours to scan.
Again, I don’t want to disable automatic scanning of libraries because I need it for non-photo libraries.
edit: Figured that part out myself, it only scans the subfolder, so it’s fine.

I’m running Plex 1.14.1.5488 with the official Docker container on a Synology DS718+

For anyone interested:
Seems like Plex doesn’t do much during maintenance, even with many photos. It finishes it work after a few minutes.

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