Hi,

I just started Persona 3 (not FES) and spent about a week in game.

Soo far soo good, only nothing much is hapening, soo the best thing to do is to explore Tartarus, where you do glorious battle with weakling shadows and get experience and moneys :D. And tarrot cards. But wait, you're tired already? Damn it, we barely had like 5 battles ffs!

Q: How do I keep the characters in my party going on for longer? I mean, I can barely clean a level and a half and someone is tired, even if they didn't do much actual fightning.

Level up and their stamina will increase. =D

I sure hope so.
I wander if that stamina has something to do with the SP (Stamina Points?) stat which you use for Persona actions.

No, SP is Spirit Points. I'm not sure of my previous answer either. I do remember that when I was in the beginning of the game the characters grew tired quickly too but their stamina became better as I progressed.

I'm sure it will work out for you too.

Thanks for your answers :).
(Right, Spirit Points, doh :P)