There is no limit to the number of libraries you can manage. Only five most used libraries are shown at the bottom of the menu you get when you click the calibre button, but all of them are listed in the Quick Switch sub-menu.
EDIT: Well technically, not all, but a maximum number that is controlled by a tweak in Preferences->Tweaks. If your number of libraries is larger than the value of this tweak then the quick switch sub-menu becomes sorted alphabetically instead of by usage frequency.
Last edited by kovidgoyal; 11-21-2015 at 07:16 PM.
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