|From Ashtanga Yoga with Pattabhi Jois YJ 1988|
It's interesting especially coming from 1988 ( I just posted Derek Ireland teaching a talk through Primary series from 1989), curious to see the presentation of a class and I love the diagrams with the little (big actually) puff of air.
For more in depth answers to questions see the interview that Pattabhi Jois gives in France in August 1991 (where you will find 10, 15, even 20 second inhalation and the same for exhalation referred to). The questions on the link below were asked by Jean Claude Garnier ( there are a couple of cheat sheets in Kristina's file with Jean Claude Garnier's shala stamp on) and written down by Gilles Kerviche. Guruji's English is hard to follow at times so Guy Donahue made some very minor edits to the text and included explanations in parentheses.
Here's the Yoga Journal interview from back before Ashtanga was that well know.
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