Only players working at this time would complain, I know. But this could give some rest - 8 hours of PvP should be enough for PvP fans, and most important result would be who wins at 11PM. Times can be different (for example 5-10PM) or there can be two time slots (8-11 AM, 8-11PM).
The other times could be used for PvE for all race/alliance combinations.