Would you actually need sub second timings or could you just monitor the soapui and http logs instead?
if this helped answer the post, could you please mark it as 'solved'? Also if you consider whether the title of your post is relevant? Perhaps if the post is solved, it might make sense to update the Subject header field of the post to something more descriptive? This will help people when searching for problems. Ta
You could put this in a Groovy script step for a single step....
def time = testRunner.testCase.testSteps["Some Test Request"].testRequest.response.timeTaken;
log.info("Step took " + time + "ms.");
If you want to time the whole test, then before the datasource step add a groovy step to capture the time. Then at the end of the test then capture the time again. E.g. endTime - startTime = lengthOfTest.