A recommended of 15 minutes listening, a few times a week for 4 weeks is sufficient for you to feel the healing properties of solfeggio frequencies.

What are the 7 healing frequencies? The Solfeggio Frequencies:
174 Hz relieves pain and stress.
285 Hz heals tissues and organs.
396 Hz liberates you from fear and guilt.
417 Hz facilitates change.
528 Hz for transformation and DNA repair.
639 Hz reconnects you with your relationships.
741 Hz helps provide solutions and self-expression.

528 Hz
Solfeggio frequency 528 Hz correlates with the solar plexus and the note “Mi,” which comes from the phrase “MI-ra gestorum”, meaning “miracle” in Latin.
528 Hz is known as the “miracle” tone, which brings wonderful about extraordinary changes. 528 Hz is the frequency of all botanical life on earth.
This is the frequency of love. In fact, mNASA has announced that 528 Hz is the frequency of the Sun, which explains the obvious connection that the effect of this tone has on the solar plexus.