Please pardon my ignorance if this question has been answered before. I tried searching this forum and the web, but could not find an answer to what exactly is unique about the 2010 MBA which allows it to have a longer standby time? Here's what puzzles me - Does the RAM remained to be powered during the entire 30-days? 1. If so, why does it cost less to keep these RAM powered than the RAM in MBP? 2. If not (the follow thread seem to suggest so), then it's NOT really "instant-on" as advertised by Apple, is it? (because it takes a few seconds to read off the FS) False advertisement? http://forums.macrumors.com/showthread.php?t=1050172 Also, how long after the MBA sleeps when it decides to power off the RAM. The above thread suggested 1 hour. Why 1 hour? How can we verify that? Can we change that? 3. Finally, what happens if we go into Terminal and change the sleep mode to 0? Do I lose the 30-days standby? or it is smart enough to override it to guarantee the 30-days?