If we can count Binding of Isaac as the same game, then it's closer to 600 hours.
But then I realized it was a shame that that was one of my highest playtimes considering I didn't think the game was all that amazing.
So I went for getting a full living Pokedex in Alpha Sapphire to dethrone Y. Worth it. If replaying the game counts then maybe Persona 4 Golden or Persona 3 Portable, they're up there
If counting replays, probably Mario 64 is tops - I'm guessing I've put around 400+ hours into it because of all of the times I've replayed it, mostly speedrunning, and I still play it today from time to time. I might even be selling that time short. NHL 2000 is up there too as I've played a lot of full seasons on it (going to say 200+ hours?), and FF7 I've played through 3 times and will probably do a 4th someday, for a total of maybe 150 hours.
If you want to be cute and call World of Warcraft soloing to be single player, than that would take the cake though. I never spent all that much time playing with others (though it's still a decent chunk), but I'm guessing I have around 20-25 days played over all characters I've ever made without ever making it to max level. Done with that game though, can't get into it without being bored now.
Division 300+ hours
Fallout 4 150+ hours
I guess next will be Wildlands.
Including sports games, SmackDown! vs. Raw 2007
Not including either of the above, Pokémon Alpha Sapphire (60~ hours)
There's really no way for me to say how many hours I put into the first two games, but I know for sure that they are my most played games in those categories. It's not easy for me to put tons of hours into a single playthrough of a game, even if it's an RPG that has enough content to fill 100s of hours. If I created a list of my top ten games based on time, all but KH would be a sports game.
100 hours in Thetrhythm Final Fantasy
110 hours in Final Fantasy XIII (platinum)
There are also alot of games i spent tons of time in (85-90)
Hours like dragon age inquisition and dark souls 3.
Surprisingly I think it's Fallout 4 at around 350 hours.
Wow. Do you ever replay games you really enjoyed? What about RPGs? Sorry, this post is just blowing my mind. Do you mostly play smaller indie games?
Whoa. You guys are hardcore.
I put in 29 hours in Horizon and wanted to die from the feeling of putting so many hours into a game. I could never do this again. I like my games short like 6 hours max.
As for myself, there are a bunch of SP games I've put over 100 hours into, but very few break the 200 hour mark. If I had to guess, I'd say FTL, Dragon Quest Monsters, and Super Mario 64 are among those very few.
GTA III for PS2 I'm sure I put upwards of 200 hours. I beat that game countless times, it was so bad I use to have dreams about driving around in Liberty City. I swear if that game's rendition of Liberty City was a real place, I wouldn't get lost.