NJ
The chicken is sealed in the Bagar (oil) first, before the water is added.
It would never fall apart or go stringy because of this. I never took any notice of timings as there was so much going on.
But it will depend on how much chicken is being cooked, but 30/45mins should do it.
Unlike Ali's good vid, these guys use much more oil and water, less tomato puree, only Teg Patta and Cassia, plus Service Onions.
I'ts usually good tasting tender chicken, but I've had some which I think has been boiled too hard or long, which was quite dense and hard to the bite.
Yes, they use a little oil/stock in the final dishes as they add the meat.
cheers Chewy