There is retry.count (default 2) which defines the number of retires if target machine was not reachable. retry.delay.ms which the interval between retries (default 2 minutes)
These values are both configurable based on the Radia version and Patch level being used.
The settings are set in the following properties file.
<InstallDir>>\tomcat\webapps\em\WEB-INF\Console.properties