When I got the plat I was at ~200ish hours? Maybe 240. Honestly it's not that bad of a plat, most of the minigames I finished as they came available in game, though some are easier post game. There wasn't too much grinding post game to max out xp as you have EXP up Materia XP up stuff to put on people and the mob packs can be killed nearly instantaneously. Some of the blue materia took longer to max out, but we're talking maybe half an hour to an hour of grinding. Hard mode is easy once you max out everything possible in normal and get the damage unlock accessory and Gotterdammerung. The REAL boss of the game is the legendary VR fights. They are awesome fights but god damn it felt like pure RNG on the last one whether you were allowed to win or not. Took me a long time to figure out a setup that worked, but I'm sure there are youtube videos that make it seem easy by now.
