lol to be on topic, i'll list the games i've spent the most time of my life on:
Dynasty Warriors 3 (PS2) - 1000+ Hours
Maxed everyone out with their final weapons, all items maxed and every stage/scenario/pattern memorized
Final Fantasy X (PS2) - 300+ Hours
All character stats maxed with fully upgraded ultimate weapons and every sidequest done
Tales of Symphonia (GC) - 250+ Hours
Game completed 4 times with characters over halfway to max levels, and all sidequests done.
Zone of the Enders: The Second Runner (PS2) - ~150 Hours
That's a lot for this game considering one play through is roughly 5 hours. Beaten the game around 25 times and did 90% of the EX Missions.
too bad none of those games have achievements, otherwise i probably would've gotten 1000 on all of them xD