Finally got the platinum trophy just now.
Had taken about two weeks off the game once I had cleaned up everything minus the final dungeon and trial mode. Had binged so much of the game I grew a bit weary of it and needed a break. Turns out Elminage Original hitting the 3DS proved a nice 65-ish hour distraction. But with Destiny 2 literally around the corner, I figured I'd finally tackle the 100 floor trial, then beat the game, and the grind out Quickening chains until I hit Black Hole and got that fucking Mistwalker trophy.
So I did just that. Trial mode took around 2:15. Bahamut was stupidly short and easy for my level 99 crew. And despite that Black Hole has been my white whale for the entire run of the game, I managed to nail it on my third attempt after beating the game, with a 15 hit chain. (My previous record was a 17 hit chain that somehow only procced Luminescense instead of Black Hole. Was pretty sure I was missing one level 2 Quickening, goddamnit.
Started "finishing" FFXII around 9AM. Had it fully wrapped by just past 2PM.
So now, I wait for Destiny 2.