On Jenkins 1.580.2, as per http://htmlpreview.github.io/?https://github.com/jenkinsci/jenkins/blob/master/core/src/main/resources/hudson/triggers/TimerTrigger/help-spec.html, I am expecting

H/15 * * * *

to generate random times depending on the project, but to run every fifteen minutes.

This works fine for builds, but not for polling, as you can see on the included image.

Related:

• https://issues.jenkins-ci.org/browse/JENKINS-15027
• http://stackoverflow.com/questions/26513386

Thanks!

Albert.