I'm not sure on the exact number of hours, but I'm certain that the following games are ones that I've spent well over 100 hours of gameplay:
Pokemon (every version that I own)
Final Fantasy X
Final Fantasy X-2
Final Fantasy A2
Kingdom Hearts
Kingdom Hearts 2
Kingdom Hearts: BBS
Disgaea: Afternoon of Darkness
Disgaea 2
Pokemon (every version that I own)
Final Fantasy X
Final Fantasy X-2
Final Fantasy A2
Kingdom Hearts
Kingdom Hearts 2
Kingdom Hearts: BBS
Disgaea: Afternoon of Darkness
Disgaea 2