I find it really odd that with all the talk of hours of use per battery charge, I can't for the life of me find an app that measures actual screen time. I know there is a timer that displays time since last charge...but what good is that? Other than keeping a stopwatch with me to start each time I power on, and stop every time I power off, how do I measure actual time of use? Would appreciate any help! Otherwise, love my N7!!