El Jay servers

They're migrating the servers (to Montana! there ought to be enough space for LJ there :-) soon (where soon = about 15 minutes from now). They're predicting at least 4 hours down, with a slow ramp-up afterward. What I don't understand is why this was scheduled for a time that so many people are likely to be using the site, rather than, say overnight, or on a weekend. *is puzzled*