5 Castles are open per War of Emperium edition and gets rotated every 2 weeks.
Training Edition : 8-10pm - Sundays [GMT+1]
First Edition : 7pm - 8pm - Mondays & Thursdays [GMT+1]
Second Edition : 9pm - 10pm - Wednesdays & Saturdays [GMT+1]
Investment Period Starts on Mondays at 9 PM and ends on Thursdays at 9 AM [GMT+1]
Warp to Castles & Info about Castle Owners etc can be found /navi Prontera 156,100