This is the acceptable use policy for the Real time DAC. 

• The real time DAC is limited to four simultaneous connections per member, or group of related members. All the limits presented here are aggregated by subscriber.
  
• Queries can be sent to the real time DAC without waiting for the previous query to return. The real time DAC will just queue the queries.
• The maximum query rate is 1,000 queries per rolling 60 seconds recalculated every 5 seconds and a maximum of 432,000 per rolling 24 hours, recalculated every five minutes.
  
• If you exceed the query limits a block will be imposed. For further details regarding 'Blocks' please see the Instructions for Use page.