After recently setting up an older desktop box with Fedora 41 KDE Plasma X.org (not Wayland due to older Nvidia GTX 650 driver needed) to use as my primary desktop instead of a backup server, while my laptop's GPU fan is replaced, I noticed that LastPass was not logging me out after a while - I could come back the next day and still be logged in -- so I checked the extension settings and set it to 180 minutes of inactivity.
... and that was several days ago.
I'm still logged in..