You have not provided the information that is mentioned in Job for jenkins.service failed because a timeout was exceeded - #4 by MarkEWaite . It points you to a blog post that outlines how to provide enough information so that others may be able to help you.
Since the user CPU time in your case is so low, I doubt that it is a performance related issue. However, without the details that are noted in that blog post, all you’re likely to get are guesses.