You can receive Raid rewards two to three times per Raid per week. The week starts with your Guild reset on Sundays at 6:30 p.m. in your Guild’s timezone. Your Guild’s timezone is the timezone your Guild Leader was in when they created the Guild, it is not necessarily the same as your Guild Leader’s current timezone.

 

Here are the official weekly limits per raid:

• Rancor (The Pit): 3.5 per week - which means three per week and an extra one every two weeks.
• The Pit (Challenge): 1.2 per week, which means one a week and an extra one every 5 weeks.
• AAT: 2.4 per week, which means two a week and an extra one every three weeks.
• Sith Triumvirate: 2 per week.