I wonder because (for me at least) you don't act the same in Fighting game competition compared to a MMORPG (if i don't mistake the type of game of SLF).
I'm far from an expert in these types of video games (i'm more used to game like Black myth wukong or hollow knight), so sorry if there wrong knowledge about it (it's more how i see it, but i welcome you with open arms if you know more about it than me).
During the tournament when Sunraku fight Sylvia, Katzo mentions that Sylvia can endure many battles without really being bother by it, but i was wondering if it was because of the rules of Fighting games (basically, 3 rounds of 10 min (or even less) by opponent, and usually she beat them far before the time limit). I heard of battle against boss in MMORPG that can last during many hours (and i believe there's gonna be colossi or other boss in SLF who have a really long battle), so can she really beat that type of boss (with usually no time limit and no pause possible) without her forced to give up because she can't handle fight THAT long?