The prime time was originally setup based on peak hours of Asia server, will see if we can move/extend the time a bit.
I get the thinking, but am I right in guessing that this is peak hours by total player population? ie, its people playing predominantly random battles? I'd imagine the more organised battles, skirmishes, clanwars etc could probably have involvement from committed players outside of the general population peak. I guess the handy thing with skirmishes is you can presumably trial earlier start time & it doesn't have the same impact that making changes to the global map would.