until the potatoes are cooked well and really soft.
the stove temperatures may vary and so you should check in between to see if the potatoes are cooked. also stir in between occasionally.
once the potatoes are cooked and soft, you can check if there is enough gravy for the curry as you need it.
if you need little more gravy, you can add some more water and heat for another 1 to 2 minutes so everything will blend together nicely. however adding too much water will make the curry very thin which won't be very good. so if you are adding extra water just add a little more water (not more than 