20 Minutes/day is all you need. Suffering with headaches? Dealing with symptoms of depression? Try meditation.
Sit or stay lying in your bed and close your eyes. Take 100 s-l-o-w breaths and actually count them out loud or to yourself, silently. Do not think of anything else! While you are counting, it's difficult for intrusive thoughts to gain entry into your brain.
If you accomplished 100 breaths, go for another 100. As you become comfortable with this "practice" (meditative practice), increase your participation in this activity by another 100 until you reach that 20 minutes....Not all at once; work up to it.