EU player forced to use US server, How often do the closed servers change?

[Metabug]

Until primals fight you can't really experience much of server-client synchronization problems.
Not being able to stun Ifrit in time at his eruption skill while pressing shield bash at 50% of the cast is normal?
Maybe it's normal for you, but it's surely not normal for me.
I'm not talking about lag (lag spikes, jumping ping, packet loss, etc.), i'm only talking about really existing latency (ping).
What is 250 ms in reality? It is 0.25 seconds. Or 1/4 of the second.
Double it, because you need at first to see beginning of "eruption".
500 ms? Half a second? Eruption cast time is somewhere around 1.5 seconds. 1 second time to react for EU players.
And if you are in US? 50 ms ping, 50 ms after bash press, 0.1 seconds total. 1.4 seconds time to react for US players. On "EU" (lol) servers.
See the difference.