On Recorder server, when we subscribe to an event, what is the typical interval to poll events from a queue

I have made the assumption that your question pertains to the status events on the Status SOAP protocol.

When you make the call

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Status RecorderStatusService2.GetStatus ( string token,

  Guid    statusSessionId,

  int    millisecondsTimeout   

) [inline]

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You set the timeout value so that you get an answer back after the timeout period. So you would implement a routine where you ask again when you have handled the answer you received, and the answer could be a blank because nothing happened and the call timed out.

The queue is limited in the sense that if 1 minute has passed with no asking there is a cleanup task run.