Samael Aun Weor mentioned that pranayama must be practiced a minimum of fifteen minutes per day. However, some students practice longer due to their energy levels and needs. Learn to gauge your body and mind, especially by examining the quality of your psychological states before and after transmutation. With time and experience, you will gain a better sense of how much pranayama is sufficient for you.
Joyful in hope, suffering in tribulation, be thou constant in thy prayer.
Benedictis, qui venit in nomine Domini. Osanna in excelsis.
"Blessed is he who comes in the name of the Lord. Hosanna in the highest!"