How do you win so quickly? I've never got a mythic girl, and it takes me pretty much the entire event time to get the legendary girl. Do you just buy a ton of gems to open all of the chests and resurrect the monsters? The best I can do is to save chests that will aid me in the next task or save my gold to upgrade the girls I am tasked with upgrading. I also hold off on freeing the epic girl to get the 1200 silver quicker (although that strategy makes the "defeat event monsters 25 times" take seven hours).
There is also the "open chest in the shop five times" quest after "level up event epic girl to Level 5." Unless you have gems to spend, this will take 20h to finish, so you have to grind pretty hard to reach this event a day before the event closes. With the "beat event monsters 25 times, open chest in the shop 3 times, then 4 times, and get so many event girls which requires waiting for event monsters to respawn, there are a lot of resisters to pass through before we even reach the three quests you listed. In fact, one of the only reasons I was able to go beyond the quest to get the legendary girl is that I have been temporarily out of work since Wednesday (due to covid) and today is Memorial Day. Normally it is quite a difficult grind to get the legendary girl when I have work (although it is still doable).
How do you make the open chests and beat monsters quests go by faster?