Lots and lots of Pokemon on GBA and DS, easily over 100hrs on Sapphire, Ruby, Emerald, LeafGreen, Diamond and HeartGold each, and the GBA games I would play over and over with many 100hr+ saves, easily 1000-1500hrs across the whole series

Other than that:

Advance Wars: Dark Conflict
Final Fantasy XII: Revenant Wings
Dynasty Warriors 7
Dynasty Warriors NEXT
Star Wars: Knights of the Old Republic (across multiple saves)
Battalion Wars 2 (hazy on this one but I'm pretty sure I got to 100hrs with multi included)
Super Smash Bros. Brawl
Mario Kart DS
The Simpsons: Hit and Run (not sure, played through it 3 or 4 times when I was younger including a 100% completion once, also played at friends' houses so may reach the mark)

EDIT: Oh, and how could I forget both Star Wars: Battlefront games! I also played some other shooters on OG XBox a lot as well (particularly Star Wars: Jedi Outcast and Jedi Academy, as well as 007: Nightfire). JO and Nightfire might be 100hrs plus (gotta love that bot mode) but again I can't be certain

i was also think that :O

Diablo II, FFX, Persona 3/Fes/Portable

It's like reading a book hundreds of times

Every elder scrolls since 3, dragon quest 9, guild wars, rune factory 4. Counting replays then ff7/8/9/tactics, zelda: oot, probably super mario world and pokemon red.

Super Smash Bros. Brawl. Me and my siblings clocked between 500 and 1000hrs into that game over the course of three years. I'm pretty sure we spent well over 100 hours on Mario Kart Double Dash as well. That game had one of the most fun 4 player mode I've seen in a game to date. Good times.

The most time I've spent on a single player game was just around 45hrs(give or take) for both FFIX and Chrono Cross, and behind those are 35hrs on Pokemon Emerald and Fire Red. Didn't finish either of those, though.

The games I've spent over 100 hours in are as follows.

Halo 2
Halo 3
Halo: Reach
Skyrim
Minecraft
Guitar Hero 3
Guitar Hero 2
Mass Effect 2
Mass Effect 3
Rock Band 2
Forza 4
Black Ops
Fallout 3

There's probably one or two that I missed.

Ni no Kuni
Persona 4 Golden
Disgaea
Final Fantasy VI
Final Fantasy VII
Starcraft

Gran Turismo 2, Gran Turismo 3, Gran Turismo 4, Gran Turismo 5, Forza 3, Forza 4, Forza Horizon, Breath of Fire 3, Final Fantasy VII, and Lost Odyssey there are probably a lot more but these are the ones I'm 100% sure of that I played for over 100 hours.

Most J-RPGs from the 90s cause of multiple playthroughs
Fifa obviously - Yearly around 1000 Online Games
Gran Turismo
Tons of other games cause Childhood was awesome!

Word of Warcraft - I think the last time i played it i had on all characters around 600-700 DAYS /played combined.
I played the game since the first Beta to the mid/end of LichKing Addon pretty much daily though i already didn't play much anymore at the end.Just came back for LichKing Heroic kill.
I remember i had a bad injury around the release of Classic WoW and couldn't do shit and played around 260 Days in my first year on my first Character.Yes 260 days.
I had easily 200 days yearly till the release of the Trial of the Crusader RAid Content Patch in Wrath of the Lich King.I then started to play Aion and after i reached Max Level there after 3 days i had enough of MMORPGs till shortly before the release of Cataclysm to get the LichKing Heroic Kill.Raided a lot in Cataclysm before i switched to SWTOR just to experience one of the worst games ever.
After that i pretty much didn't have anytime anymore for MMORPGs - Im glad ESO is shit and WIldstar is still a little bit more away though i don't hope it is as godly as it looks cause i don't want to invest that much time anymore in that Genre.Cause there are only 2 options for such games > Progression Raiding or wasting time.