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 9 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.
852 Hz is for intuition and awareness
936 Hz is for clear your mind

741 Hz:
Solfeggio frequency 741 Hz corresponds to the note “Salt” and the throat chakra. Solfeggio 741 Hz frees us from all superficial, extraterrestrial influences, subordination, and dependence on outside ideas and world views.
In this way, the path to our true self-expression opens up for us. Listening to Solfeggio 741 Hz leads to the incredible growth of creativity, generating creative ideas, and achieving our goals.
Frequent use of Solfeggio 741 Hz can help with our journey to a healthy, simple life. It can assist us with dietary changes. For example, you might begin to subconsciously choose foods that are not poisoned by toxins.
This frequency also helps clear the cells of various types of electromagnetic radiation. Another important application of Solfeggio 741 Hz is the possibility to help with purification of infections: viral, bacterial, and fungal.
Solfeggio 741 Hz promotes a pure, stable, and spiritual life, filled with the joy of creativity and true self-expression.