I got the galago pro ultrabook. Had a back-and-forth with a guy on their engineering team and he said approximately "a solid 3 hours, generally 3-3.5 hours. But dealing with pre-release machines, not the ones that will be actually shipped out. Hopefully this will be higher with the actual ones." The one I ordered has a 240 GB intel SSD and 16 GB of RAM, but I don't think that really matters. It's the power-hungry Iris and the really nice display that kill it.