Choose your Endpoint Server from your Enforce Server Console, then click 'Server Settings', you can see the 'Server Detail - Advanced Server Settings' page.
There is an option named: EndpointServer.MaxTimeToWaitForWriter, and the default value of this option is 1000
The meaning of this option is: The maximum time (in milliseconds) that the agent will wait to connect to the server.
That's mean, by default, the DLP agent will check the communication with the Endpoint Server every 1 second.