Sieges:
Brazilian Time - 10 a.m - 12 p.m - (right before players going for lunch with their families)
CEST - 03 p.m - 05 p.m - (right after players went for lunch)
Koreans - 22 p.m to 00 a.m (not too late for players that need to work on next day)
Chinese - 21 p.m to 23 p.m (not too late for players that need to work on next day).
This time is the best.
oly = Currently, Asian people have oly time in the middle of their sleeping time. It is better to start 3 hours early or delay 3 hours. Either go to bed early and wake up early to play oly, or go to sleep after finishing oly.