„Development of nadi shodana […] ratios and counts in each technique may take many YEARS – Each time the ratio is changed, start with a low count and build up gradually without strain. Practise a given ratio until perfected. The length of the breath should increase spontaneously without the use of force. – The point is not how long the breath can be held, but rather to give the mind, body and lifestyle time to adapt to psychic and physical repercussions.“
Swami Satyananda Saraswati, Asana Pranayama Mudra Bandha, Bihar 2012, S. 395