The message displayed when a lesson activity has timed out is incorrect.
Attention: You ran out of time for this lesson. Your last answer does not count because it was answered after the time was up. Please push the continue button to finish the lesson.
There is no "Continue" button on that page (although there is a continue link on the page before this message is displayed).
If the "Return to Lesson" button is clicked the user is returned to the course page and not not the lesson.
Furthermore, the lesson appears to be ended once the time is up - this is at odds with the description of what happens in the "Timed" help file..