I for one hate hate hate time limits on games. I think back to Nwn 2 Mask of the Betrayer and the spirt meter. It "can" take away from the game. In a tactical game like this. I would hate it. I want to explore everything. I don't want to have to chose this quest over that one. This gear over that gear.
From my rough estimate, you would get to level 5 1/2 to 3/4.