JUnit.org Resources for Test Driven Development

Hi All,
I'm using JUnit to run tests on NetBeans 6.5 and having a test timeout after 1200 seconds (20 minutes).
I need to overcome that restrictions because I need to run multithreaded load tests that might take longer to execute.
I tried annotating my tests with @Test(timeout = xxxxxx) but the test stops after 1200 seconds.
Is there any way to set the test timeout to more than 20 minutes?
Thanks!
Marcelo.