How would you objectively determine the point at which macroevolution occurrs?
Consider that question, and the meaning of the words, and you can answer it yourself.
'Micro' v. 'macro' is only 'little' v. 'big'.
At what point do you say that something that has changed a large number of small times has been changed in a big way?
It would depend on the specifics of the changes, in every example from the real world I can think of.