I have always been confused by Blizzard's maintenance windows. I work for a company that, among other things, delivers on-line education content. There are literally millions of students connecting everyday. The amount of time those systems are down for maintenance is minuscule compared to Blizzard. Always wished I could get an inside view of what was going on with this aspect of Blizzard...
“Extinction is the rule. Survival is the exception.” -- Carl Sagan