Brew until the pH has been at 3.7 or below for a day.
Hey lost, I think that doing what you say, you will easily end up with all the food in the water and the lacto colony will be reduced by adjusting to the present food. I am not sure of the reason to leave until the pH drops to 3.7, it is the point in the highest population of lactos, right? which is good, but leaving more is not good or efficient, after the peak of efficiency they begin to die, leaving room and food for other types of life.