Might look like a stupid question. Honestly, it won't change my life, but it's just something out of curiosity. I just bought the 13-inch mid-2013 MBA and the battery is really outstanding ! However, I was just curious about how to optimize the battery... My question here is, we know that booting the computer takes little to no time, but still takes some energy, and being on standby also takes some energy. So, I was wondering, after how long does the standby energy equals to the energy to boot the MBA? Just so I know, let's say it's after two hours, then I know that if I plan on only using my computer in 3 hours, I should turn it off, or else if it's in 30 minutes, I should just let it sleep. Please no comments about how it won't make any signifiant difference, I know !