|Step 3.9 - Settings -> Timed Messages Settings|
Only master can use the Timed Commands (IM commands):
Yes - If set to Yes, only the master can use the Timed IM commands.
Minimum time and Period:
If you want to ensure that your operators don't advertise in the groups too often, set this to the minimum allowed time.
A value of 30 minutes will ensure that a Timed Message can't have a timer with anything less than 30 minutes.