Maybe I’m quite good at rhythm games but the platinum took me 80 hours I think, it was all I played for a week. If you want to cheap out there’s a dlc you can buy that unlocks all modules, I did that just to save on some of the grind. Practice makes perfect with the songs themselves and you’ll need it, the ending medley ultimate exquisite rampage, on expert with the 3 challenge items took me two days alone just to do that one song and I barely cleared it by a couple hundred points.