It is open for 4 separate sessions each day which are an hour long : (EDT) 4 a.m., noon, 7 p.m. and 10 p.m.
Adjust the time for SEA servers, most of the SEA players (including me) can’t participate during that time because we have job/school/etc… We live in +6 ~ +10 GMT timezone. We can only play at night.