5-10 minutes of reflection on a verse or two. Use it to help kickoff your day by reflecting on God and His plans for you, or anytime you want to set your mind on spiritual things.
A Lenten reflection. Here are links to ...
St. Augustine's "Confessions" - http://faculty.gordon.edu/hu/bi/ted_hildebrandt/SpiritualFormation/Texts/Augustine_Confessions.pdf
and
St. Catherine's "Dialogue: A Treatise of Discretion" - http://www.catholictreasury.info/books/dialogue/diag38.php