I was wondering is there an App for MacBooks that record usage time? For example, every time I wake my Mac the counter would record the time until I put it to sleep. And do it then again, until I reset the timer. So after a single charge, it would say elapsed time: 3 Hours and 25 Minutes. The reason I ask is because it would allow me to see how long I get from a charge - the time that the MenuBar states fluctuates on usage and isn't too accurate.