Long-Running Load Test

I want to run a Load Test for days to stress test a set of web services. Set up is very simple - call the web service, check for proper response, sleep for 5 seconds, repeat. If any errors are encountered, then just abort the test and stop running. I have a Load Test defined, working in soapUI 3.5, and working from SoapUILoadTestRunner on the command-line. What I want to do is limit the amount of progress messages that are output from SoapUILoadTestRunner when the Load Test uses a "runs per thread" limit. Is there a way to influence this, or to even turn off progress reporting?

Also, is there something under Load Test Options (or anywhere else) that I should consider changing to enable SoapUILoadTestRunner to run for days? I want to avoid any accumulation of information that might cause the JVM to run out of memory.