Fights that drag on for lots of chapters are boring. It's all just so arbitrary. Like, now they're on the attack, now someone got wounded, they healed them, now they're all synchronizing for an awesome combo, oh no it didn't work, now they're gonna die, but wait, the elf stands up. Like, this could just keep going forever, so when the fight actually ends, it's like "why did it end now and not sooner, or later?". There is no reason, the author just arbitrarily decide to end the fight, or not. We all know MC's gonna wake up in the nick of time and save everybody anyway, there's nothing to be surprised about, so just get to the point already.