A:Answer I get 8hrs with some battery life to spare on a typical day of work that involves some excel sheet and windows doc action, VPN, some terminal windows for access to Unix machines, about 20+ browser windows, maybe one join.me screen share session lasting about 30mins utilizing the mike and speakers as well, a usb device that serves as the wireless adapter for my microsoft wireless keyboard and mouse, some virtual machines running 1 to 2Gb of memory each (within vmware), yeah about that much.
Hope this helps!