Well if you buy into the idea of doing productive work on it (which Apple bent over backward to push during the unveiling), then all day shouldn't be out of the

Well if you buy into the idea of doing productive work on it (which Apple bent over backward to push during the unveiling), then all day shouldn't be out of the question. But personally, I just read a lot (research papers, online, and recreationally), so something that would get me from 6pm to 3am without running out of battery is a requirement.