To begin 10-20 minutes, later 30-60 minutes
The eight levels of Self-Inquiry Meditation are described at the end of the eight exercise levels. Level 1/6 is focused on Concentration on the Anahata Chakra (Heart Centre):
Direct your attention to the centre of the chest and be aware of the gentle flow of the breath in this area.
Feel the calm and even beat of your heart and through this continue to deepen the relaxation.
Finally direct your concentration fully to the centre of the chest, the heart centre, and immerse your consciousness in your heart.
Visualise a stream of light in the centre of your heart. Feel light and bliss in the centre of your heart (Hridayakasha).