here's the link
... and here are a couple of Q and A's with Pattabhi Jois from the 'On practice' section, France 1991.
"Question: what is the good environment temperature for yoga practice?
Answer: Cool. Cool place, heater I don’t want. Automatically your body will be hot with breathing. Cool time you will be starting your practice. Cool place. Much cool is coming in your country, after you use heater (if it is very cold, then you can use a heater). This is very bad. Don’t take heater, otherwise you energy is gone. Automatically, you do breathing you will be hot. Practice, practice with breathing and you will be increasing your body heat. That heat is energy. Energy you want. Don’t use the heater while doing the yoga practice. That is very bad, your body will not be good, your health also will not be good.
Answer: Yes correct. Take one asana, finish it. After full vinyasa you do, standing position you come. Again next. Your strength how is you use (depending on your strength you should do half or full vinyasa). Without strength chat (sixth vinyasa) stop (If you are not strong stop at the sixth vinyasa eg do half vinyasa). Increasing your strength, you full vinyasa you take. Now there is no time (too many students).
That is why I am telling. One asana, for example paschimottanasana (has) 16 vinyasas, Purvottanasana - 15, Ardha baddha padma paschimottanasana, tiriang mukeka pada paschimottanasana, janu sirsasana A, B, C, marichyasana A, B, all 22 vinyasas. Full vinyasa .
You doing full vinyasa all - that is the best. Secondary you with sixth vinyasa all the asanas is coming. That you changing, this time (when) your strength is more, you changing that time. Sixth, seventh (vinyasa) paschimottanasana you do. After 8 – 9 then jump again. “sat” (six) position you go. I every day I teaching now. Same method you do. Both is no problem
Method is good no problem. Work is there. He is going work. (for a working man half vinyasa method is good) Your yoga practice, you take one hour. One hour or two hours your expanding your time. That time all the asanas taken one day full vinyasa you do at least five hours also you want you can understand (if you take full vinyasa, you need 5 hours to complete practice). One primary asanas doing, 5 hours also you want. That is why. You (are a) working (man). You not spending all the time on the yoga practice.
You can understand. Full time you take, full vinyasa you doing. Only for (completing) primary asanas takes 5 hours. 5 hours primary postures (with) full vinyasa. 50 asanas is there completely primary postures. That 50 asanas you doing taken 5 hours, with full vinyasa. You working. Another place is working. Yes you take money, you eating food, all you want. That only for your spending (free) time only for yoga, very rare (little time), very difficult also yourself. That is why you short cut you take. That is one or two hours. Two hours spent your yoga practice. That is good. That is also is good. Yes OK. That I tell you.
Answer: Only one breath, inhale one breath, exhale. Inhale, exhale only one breath. Inhale 10 seconds or 15 seconds then exhalation also 10 seconds or 15 seconds. This is 10 times I am telling, you don’t understand!
Question: Yassin is asking if he should stay longer in kurmasana or in back bendings. You give some timing like 10 breaths for kurmasana. You give 3 times five breaths for urdhva dhanurasana. Yassin is asking if he should stay longer. He wants to stay longer sometimes.
Answer: I telling: all the asanas you take practice how long your strength is so there, you take. Long time he is doing, 100 asanas you do - 1 asana is perfect. Long time sitting all the asanas he is doing time, you 1 take 10 breath or 15 breathing. You count it. Practice, that is all. You long time you sitting, kurmasana is long time, 3 hours is possible. One asana is perfect, taken 3 hours. Now practice how much your strength is there, you take. That is no problem. Your strength is 10 breathing is doing possible, you do 10 breathing, 15 breathing you possible, you do 15 breathing. One hundred possible, 100 you do. 5 you do, 5 is possible, 5 you do. Take practice, that is all. I am telling only for practice. Fix completely perfect. Asana, one asana siddhi, you do hundred asanas, one asana is coming, one asana perfectly is coming. That is real.
... one asana is perfect perfect perfect. There is one link from one asana to one asana. Link is there. Those asanas you take, all. One by one. One by one, all perfect it. After you do back bendings. That is back bendings asanas. Primary asanas, not much back-bendings is coming - you know! Intermediate asanas little, little starting: Ustrasana, laghuvajrasana, kapotasana.
After that is very perfect, take advanced postures. Advanced postures is more back bendings asanas: triang mukha uttanasana, padangustha dhanurasana, eka pada raja kapotasana, raja kapotasana, all is back-bending asanas. There is advanced postures is coming, more back-bendings asanas. But that time one by one you do, after no problem.
You first try primary. "Oh my body is bending! That is why I will take back-bendings. I will put it only for back, complete back bending. That is how it is better engaged." (my back is flexible so I will emphasise back bending in practice) After starting sick (you become sick). You don’t walk also! Many people suffering this one...."