Unit test times wrong?

Hudson log reports Ran 182 tests in 39.448s
Hudson test result page shows (root)    2.3 sec 1       0       182 

xml file shows 
  testsuite errors="0" failures="1" name="" tests="182" time="39.448">
  but individual test times are way too short

I suppose the unit test xml file somehow contains invalid times for individual tests.
