It's all up to Sanchez IMO. If Mark balls the less we see of Tebow.
Last pre season game Mark didnt do much. Tebow did some of what he does well. If Mark struggles again Saturday and Tebow does more of what he does well, we will have talk of Tebow getting more and more snaps. And lets be honest here. If we keep struggling on offense, Tebow style "may" be our best offense. If the rest of pre season the offense moves the ball better with Tebow in the game we could see more snaps than orginally thought in the first couple real games.
Again this is all on Sanchez, if he does his thing, Tebow wont see the field but a few snaps a game. If Mark struggles and the offense is not moving the ball we will see Tebow often.