I am using Hudson 1.243, but have observed this for some time.

When viewing the page for a specific unit test (not its contained class), if the
output of the test has lengthly lines and the test is failing, the "failing for
the past 5 builds (Since #139)" text is displayed offscreen to the right. In my
case, very far to the point developers do not know that Hudson makes this
information available when hunting down certain test failures. Regardless of
passing or failing, the took X seconds" text has the same issue

I think that since most other text is always displayed in the visible portion of
the browser page, the "failing since..." and "Took 20 seconds" text should have
the same behavior