Parametrize load test duration in SoapUI

I am currently using SoapUI for load testing my web service. Typical test case includes few load tests. These test are part of integration testing. I have managed how to call this tests from java class during integration-test phase in maven:

@Test
public void testExecute() throws Exception {
    WsdlProject project = new WsdlProject("src/test/soapui-project.xml");
    for (TestSuite testSuite : project.getTestSuiteList()) {
        for (TestCase testCase : testSuite.getTestCaseList()) {
            TestRunner runner = testCase.run(new PropertiesMap(), false);
            Assert.assertEquals(Status.FINISHED, runner.getStatus());
            for (LoadTest loadTest : testCase.getLoadTestList()) {
                LoadTestRunner loadRunner = loadTest.run();
                Assert.assertEquals(Status.FINISHED, 
                    loadRunner.waitUntilFinished());
            }
        }
    }
}

What I want to do is to parametrize load test duration, so I can run quite short tests (for integration test purposed only) when I am during typical development deploy and be able to do long extensive test during night test builds.
How can I achieve that? Can I do this in Setup Script of load test (if yes, please help with this, I have no experience with SoapUI scripting) or is there any other way to achieve this?