I'm not sure I fully understand your compaint....
All servers get the exact same duration of event time. If, due to your time zone, you're "losing out" on time due to maintenance, that also means that you "gained" time when it started (instead of event starting at 6pm, it started at 3pm due to your time zone in US, and you potentially get more time to use it on first day then someone who started at 6pm)
EDIT: All US servers get same duration, which is cut off by 2 hours due to maintenance occuring at 10pm monday night PST, but the eu servers do get full duration as their maintenance begins after the event ends...I can sort of see why this is a problem, but 2hrs less is better then none at all.
This post has been edited 2 times, last edit by "BlankMinded" (Jun 2nd 2015, 2:15am)