package p;
import org.junit.Test;
public class SomeTest {
    @Test public void t1() throws Exception {
        Thread.sleep(1000);
    }
    @Test public void t2() throws Exception {
        Thread.sleep(1000);
    }
    @Test public void t3() throws Exception {
        Thread.sleep(1000);
    }
    @Test public void t4() throws Exception {
        Thread.sleep(1000);
    }
}

When run, the subnodes "t1" etc. display "passed (0.0 s)" until the end - then the numbers change to "1.006 s" etc.

Even if <junit> does not report times until the suite ends, surely you could estimate the test times according to the elapsed time between the end of the previous test (or, for t1, start of suite) and the end of the current test?