Unity Step 4

Each group should be self-governing except in matters affecting other groups or Gamblers Anonymous as a whole

Each Gamblers Anonymous group has great latitude to conduct its affairs within the framework of the Fellowship. 

This preserves the freedom of choice that is so important to the group conscience. The conduct of each group is limited only to the extent that its actions would conflict with the Guidance Code of Gamblers Anonymous.

What type of meeting, how long the meeting lasts, break or no break, etc. affects no one but those at that meeting. However, the breaking of anonymity is something that affects others and is not a group choice.