I have 32415 hidden resources (most of them from the free Library of Early English History, Library of Early American History, and Perseus collections).
At one point I had hidden all the volumes of Filología Neotestamentaria. I decided I wanted to unhide that, and frustratingly I have to unhide one volume at a time. Ugh! (That's a topic for another thread.)
Unhiding one volume took about 25 seconds and froze my machine while it was working.

With 33 volumes, assuming it also takes me a couple of seconds after each Unhide to right-click and unhide the next one, it's taking about 15 minutes to unhide all those volumes. (Well, longer, since I've paused to enter this report.)
Here is the log file for a short Logos session where all I did was unhide one volume of that journal.
6507.Logos.log