Since I got the Ocarina of Time I begin to play a bit more than 30 - 45 Min. at a stretch. However, this made me realize that this "deep 3D" or "looking into another world" if you wanna call it this way, vanishes. Thats happening for me after around 1 and a half hour. Sure its still different than in 2D Mode, but its not a huge leap anymore, like on the beginning. After making some hours break, the 3D Effekt is back in all its glory. At all, every Picture, even if its flat, gets 3D in our mind, the 3DS or 3D glasses helps to make it feel more "real". After how much time does this happen for you?