Well, about 45 hours and I completed the game up until the true ending. The combat is fun although you don't really have to participate (just mashing X is fine 95% of the time), the girls are cute, playing dress-up is sort of addicting. That said, if this was a visual novel I would have dropped it around chapter 8. It's the poorly written story detailing the terrible choices of a blindly-selfish, inhumanly stupid 6 year old Mary Sue that rallies the support of everyone around her (also Mary Sues) "because she is so pure of heart" to help kill 5,000 teenage girls so she can see her mommy and daddy one more time (literally. that's it. that's the story.).
Okay, so the writing, characters, and story are shit. Nothing new here. What really made this an unsatisfying story was 2 particular characters with a massive amount of screen time that deserve to get bitch slapped, but never do. This sounds like a small thing, but when the characters are always showing up and always being dumb or obnoxious without so much as someone telling them to shut up, it really adds up over the course of 40 hours. You are forced to roll over and take it. Stuff like this:
1.) They rarely lose fights (the game forces you play as them, thus you have to win, and I imagine that feeling is similar to what cucks feel when they're helplessly forced to watch).
2.) The bitchy comments they make are always 1-sided verbal assaults with no one defending themselves or each other.
3.) Any stupid idea they have (and, frankly, there is some really stupid decisions being made by these girls) always gets unwavering support even from people they're supposed to be fighting with. Usually for some emotional reason involving believing in each other, feelings, or hope. Normal superficial bullshit that leads to bad outcomes because they ignore logic. Of course, everything always works out perfectly for them.
However, you can pick their outfits. Put a syringe sticking out of their their boob, some armpit hair, panties around the ankles, cum stains on their face and hair (ice cream or whip cream shrunk and morphed), relay baton up their ass, a tuna between their tits, fake moles on their tits, mushroom (penis) necklace, go nuts. You pretty much have to mess them up to ease annoyance every time they show up on screen.