I clocked 50 hours my first run 0_o (super-slow and thorough XD)
That super-slowness was somewhat a burden for me post-Cyseal content, so little I went through :p
Oh, and while indeed you can set AI-personalities, I personally have to say I find it awesome to discuss with myself, as does my IRL friend who I convinced to buy OS.
Whatever floats one boat I guess...