None really. You can extend the life by dimming the display, shutting down applications (including browsers), but if you are coding, compiling, testing and deb

None really. You can extend the life by dimming the display, shutting down applications (including browsers), but if you are coding, compiling, testing and debugging no mac (or really any laptop) will last 8 hours that I can think of. This is especially true if you have device plugged into it for any significant amount of the time. If I am doing more heads down coding and less cycling through testing etc, my 15" mac retina does ok but I am typically around 6 hours disconnected IIRC, and sometimes as low as 2-3 if I am doing firmware work where I have devices plugged in a lot of the time. Honestly IMO, this is really good and I don't need/expect more then that right now. Right now, with a 99% charge and only surfing HN and doing some reading my mac is telling me I have 10:45 left, but it isn't working much obviously. EDIT: specifically I have a mid 2014 15" macbook pro