Training occurs on Thursday or perhaps early Friday in Bulgaria. Under the Rules, there is a Weekly Schedule section that should have the schedule for your country.
Thursday scrimmages can played internationally, with game time according to the schedule of the host country. So if you play in the USA, it would be early Friday in Bulgaria (03:00 I think).
Training is based on minutes played during the 3 games of the training week, the Saturday and Tuesday league games, and the Thursday cup/scrimmage game.