That's what they pay playtesters to do.
And then reviewers are paid peanuts to admire to admire they hell we didn't have to go through. Okay, I know it's rare for professional reviewers to finish the games they talk about, but I try to finish mine whenever I can and I happened to have enough time for this one.
It wasn't all that hard to finish. The game is playable, it's just not all that enjoyable because there is just way too much padding. For instance, figuring out the pattern a certain enemy uses so you can counter it, is rather fun. When you slaughter the next one within mere seconds, it feels like an reward. Then the game expects you do it another hundred times or so. It's boring, but you'll get through the monotony if you've been playing RPGs since the beginning of consoles.
The true test of patience are the characters. I've met sheets of paper more three dimensional than they are. I guess the writer wanted their personality to match their appearance.
Edit: I should mention that, as soon as I got fun time magic, I turned down the volume during boss battles and put on Magia from Puella Magi Madoka Magica instead. It made everything better.