I don't invite a lot because I don't tend to use monsters in fights. I did have Mustadio (as a meditator) raise people's faith so that they'd be stronger with their spells, however, so I am familiar with long drawn out battles where there is one chocobo I keep hitting down to low life so he heals himself and Mustadio trying to raise everyone's faith interminably while Ramza is screaming so that he can get more JP and someone's casting shell and protect over and over and so on.