Jade is not a short game. It takes me 41 hours to complete in my first. Also, it has a nice replay value. I bought it first day, and still playing it. I love that game.
Now, i am waiting for Kingdom of Paradise for my PSP. It offers 50 hours of gameplay and Chinese-Japanase hibrid background. Gamespot says "The combination of both Chinese and Japanese influences gives Kingdom of Paradise its own unique feel, though in another way this makes the game quite reminiscent of this year's Jade Empire for the Xbox, another martial arts RPG set in a made-up version of the ancient Orient."