"(caturanga Dandasana) ...Remain in this stithi for at least ten minutes..."
"(Urdhvamukhasvanasana)...make the effort to practice until it becomes possible to stay in this asana for fifteen minutes."
"(Ardhomukhasvanasana)... As a result of the strength of practice, one learns to hold this posture for fifteen minutes."
"(Trikonasana)... This asana must be practiced for a minimum of ten minutes. However slowly and patiently we practice this this, there is that much corresponding benefit."
"(Mayurasana)...This asana stithi should be held from 1 minute to 3 hours according to the practitioner's capability..... If this asana is practiced every day for at least fifteen minutes, a lot of benefits are achieved."
" (Tadasana)... Stand with arms raised above the head, for fifteen minutes daily. Make this a routine."
For more on extended stays, my Ashtanga Rishi Series page
'Originally there were five series: Primary, Intermediate, Advanced A, Advanced B, and the fifth was the “rishi” series'.
Ashtanga Rishi Approach
'...Doing a practice of 10 postures for up to 50 breaths is a method of preparing for "advanced series" after one has learned 1st and 2nd. It can be done once or twice a week. One does the "salutations" and then starts going thru the series, holding each posture for as long as comfortably possible. Notice which postures could be held for 50 breaths. The next time you practice this way, the postures which you could hold for 50 are omitted and new ones are added at the end. One gradually works thru the series, dropping and adding asanas, still doing 10 asanas per session. I have gone all the way thru 1st and 2nd this way several times over the years and have found it beneficiall'.
Ashtanga Rishi Series
'Then, once one has mastered all of the asanas, one can practice "the rishi series", the most advanced practice. One does the 10 postures that one intuits will be the most beneficial and appropriate for that day, holding each posture for up to 50 comfortable breaths'.
To explore these longer stays, I decided on a 'Rishi series' practice this morning.
Started off with my regular Vinyasa Krama ten minute tadasana routine followed by....
Tadasana : 5 mins rather than fifteen (could have stayed probably for another five but decided not to overdo it first go)
Five regular Surya namaskara's 2 A's , 3 B's
Ardhomukhasvanasana : 10 minutes (have been working on longer stays here for a while, good for waking up the bandhas).
Urdhvamukhasvanasana 5 minutes (amazing how the hips drop on their own as it goes on)
Caturanga Dandasana : 2 minutes only, half a minute rest after the first minute but managed twenty-five breaths).
Trikonasana : 5minutes (two and a half each side then repeated)
Mayurasana: 1 1/2 minutes only ( Kept falling out of it after five to ten seconds, sweaty. Took four goes to reach twenty five breaths - Fiffteen minutes daily…really?)
For the rest of the practice I included some of the longer stays Krishnamacharya recommended to Ramaswami
Maha mudra : 5 minutes each side
Paschimottanasana : 5 minutes
Savangasana : 5 minutes
Sirsasana : 5 minutes
Badha konasana : 5 minutes
…..then on into pranayama, pratyahara and Japa (mantra) meditation.
Good to be reminded that the postures within the Surya Namaskar are postures in their own right and to treat them as such. I may not stay for twenty-five breaths or ten to fifteen minutes each morning but will stay in Ardhomukhasvanasana, Urdhvamukhasvanasana, and Caturanga Dandasana for a good five to ten breaths more often. Trikonasana I've been staying in for longer recently anyway and I've been practicing mayurasana again recently, for the last couple of weeks.
I was wondering, could Krishnamacharya really stay in chaturanga dandasana for TEN MINUTES, and then I remembered the other version pictured in his Yoga Makaranda, where the hands are placed much lower, almost at the hips.
I tried it, really really hard. If Krishnamacharya could hold this posture long enough to have a photo taken in the 1930's then he probably could hold chatauranga for ten minutes.