BigBen, you need to add a bit more variaty to that poll. I was inbetween two sections so I went with the lower one
For me, on average, about 6 hours. My body is not quite use to it yet because I can feel it trying to doze off every once in a while. Also, I feel like crap in the morning after 2 hours if I dont have a mug of coffee. (Damn black elixir of life!!)