Dungeon Quest [Idle Magic Academy]

Compared to the dungeon quests I've done so far, the progress is slow. I feel like I'm progressing reasonably, but maybe the attack power setting is too low? Will I be able to finish it within the remaining days...?? It seems like I'll get the gem guarantee even if I can't defeat it, but I wonder how much the guarantee is. Since I've always cleared it without failing, I feel like I'll be unsatisfied if I fail~ Well, I intend to do as much as I can and struggle.