Thanks for posting this Bryan.
I'm betting that the times posted so far are in fact for NA time zone....but..not sure which one there, so we'd still need to know that also.
I'd like to ask where you are seeing these messengers for the castles so if you would be so kind to tell me either here or in game I'd appreciate it. (I'm TerraMagic from Legendary guild).
If you do find out more information will you also post it here so we ALL can learn it? Thanks a lot.
cya in the game!