I'm not sure if it's a good idea to put your maintenance on prime time just so that it's easier for your own maintenance schedule. As far as I can tell those maintenance time don't really benefit Euros, and Japanese are on their own server in theory. If other MMORPG operated on the same logic, then all US based MMORPG would have patch time at 1pm-5pm or so. Instead usually patch time is at 1am because they want to minimize disruption to their customer base as much as possible. The funny thing is that it'd be considerably less of a problem for Japanese guys to maintain server at 1am compared to any US based company, yet apparently US based companies have no problem getting up at 1am to do maintenance.