The console output includes the time taken to run the tests; however, the junit output does not include the time attribute. It would be ideal if it could ouput the time per test, but time per suite is good enough.
Time is an attribute on testsuites, testsuite, and testcase:
https://svn.jenkins-ci.org/trunk/hudson/dtkit/dtkit-format/dtkit-junit-model/src/main/resources/com/thalesgroup/dtkit/junit/model/xsd/junit-4.xsd