Probably a case of getting every stat point. Checked times for previous playthroughs:
- Crimson Flower (Hard, Casual, First run): 65:13
- Verdant Wind (Hard, Casual, New Game+): 81:18
- Azure Moon (Maddening, Casual, New Game+, first DLC): 91:03
- Silver Snow (Hard, Casual, New Game+, Low-grind): 27:04
Severely limited things in Explore (no fishing, tea parties, lost items, or pretty much anything requiring activity points) and Battle (quest/required battles and paralogues only) for the Silver Snow playthrough. Said no to qualifying for multiple classes in a tier and skill experience grinding. Chose between Seminar and Rest most of the time. Skipped through some repeated dialogue, also. Cut down on play time significantly, as you can see.
Wound up significantly less powerful. Compared Petra between the Golden Deer and the quick Silver Snow run before the final map. Differed by 10 levels and a combined 79 stat points. (Accounts for some of that for being in Falcon Knight versus Dancer.) Still won anyways.