Longest game I ever played was Just Cause 2 (massive game world)! It was a free PS Plus game - thank you Sony.
Second longest game for me was Far Cry 2 (82 hours) - another free PS Plus game.
So, what was the longest game you ever played?
The longest game that I have played recently would be Ubisoft's 2008 Prince of Persia but to me the longer the better.
The shortest game I've ever played would have to be Kid Icarus Uprising. That game was so much fun it felt like it was mega short. I also feel like Ratchet and Clank Size Matters should have been MUCH longer.
Are you saying:
Longest playtime I've invested in a game, period?
Or Longest playtime I've invested in a game, to beat the game?
Longest time I've invested in a game (to beat the game), was Lost In Blue for the Nintendo DS. Lasted me a long time (don't know exactly how long), but it was 315 in-game days on the island before I got off.
Longest time I've invested in a game period was Final Fantasy X. 725 hours, 35 minutes.
Most of my RPGs I'll put at least 40 hours in, often closer to 100 hours.