no, if your layout size of "HUD" is the same like your screen size, you'll be able to see the timer all the time. this layer has to be transparent and on top of your game layer. the textbox of the timer is on layer "hud" and the car, road usw on one layer underneath "game".
only set parallax 0,0 to the hud layer.
and "scroll to" to the car or whatever