the cave

Disgaea 3. Dat content.

Atelier Meruru.- Not the best game of my library, but damn, crafting is so addicting

Honorable mention to Disgaea 4, it never ends

No idea. The PS3 doesn't have that thing Nintendo has that tells you the amount of playtime of all your games.

I've played over 100 hours on Yakuza 3, Yakuza 4, Dragon's Crown, White Knight Chronicles 2, Playstation All Stars(eww,) and Unreal Tournament 3.

I'd say that Unreal Tournament 3 probably has the most playtime out of them all.

Ratchet & Clank: A Crack in Time.

Wow.

OT. Borderlands 2 playing with the Mechcromancer and Siren is a very fun time. Farming and looting I think I got over 12 days worth.

Don't kill me, but...
Sonic 06. Played through the whole game 3 times since I had to move from my fat PS3 to the slim one and lost the savefiles in the process and later on the slim and a hard drive error had formatted itself. I'd guess that I've spent about 100 hours on the game.

Warhawk, then marvel vs capcom 3

For me, I play most PS3 games that I own once--just long enough to finish the campaign and toss it on the shelf. The exception was LBP2. My daughter loved that game so much and she always drug me along for the ride. We played so many user created levels where the goal was grocery shopping or making a sandwich. I hated it.

Now, I miss it. :(

1st. Ninja Gaiden Sigma 2.

Campaign complete 4 times (with a mentor and ninja master run to come eventually)

Played the co-op op trials online hundreds of times.

2nd. Resistance 2. (many an hour online).

3rd. Gran Turismo 5.