Tourneys are held whenever there are promo-team hosts available to do so. They try to keep fairly steady steam of tourneys going throughout the day, but sometimes there just isn't a host available.
In short, there is no 'defined' time for the tourneys. If a tourney has a defined time, chances are that there is a thread about it in the Events forum. Otherwise, it's somewhat random... however, certain hosts are on at certain times and tend to host consistantly within that time frame...
Hope than answers your question.
Last edited by Brainstorm; Mar 16, 2009 at 05:27 PM.