As your pH comes down, so will your alk--and as the pool is aerated by swimming, splashing, etc, the TA will slowly be stripped away (until it raises again when you top off your pool )

There's not much of a way for me to guess how many additions it will take to bring the pH down--a lot depends on how high the pH really is, what your TA is (the higher the TA, the more likely it is to take more MA) and what your actual doses really are. You'll just have to add, test, and adjust--trying to shoot for exact numbers doesn't work very well!

Janet