I go crazy under 6 ... That's why i'm spending more and more time behind my chromebook; it has all day battery life. My laptops hardly make 3 hours and it makes me not want to use them for much of anything anymore.

It's the one thing that hasn't improved over the years.

My laptop goes easily to 7-8 without changing my usage significantly, 9 if I'm only doing email. I hardly carry the power brick outside the house anymore.