Thus, there is no distinction at all between "microevolution" and "macroevolution".
"set of animals or plants in which the members have similar characteristics to each other and can breed with each other"
Breeding is a criteria for differentiating species and also there is a lot of difference between theory and practice.
“Can interbreed” is a fuzzy line too, the probability decreases as genetic distance increases but it doesn’t just suddenly stop. Sometimes very different species can interbreed, and sometimes a small change is enough to make it stop working. Of course, often breeding can be accomplished with human intervention, but never in nature, for simple mechanical or behavioral reasons.
For Macro, isn't it just longer. 300 years, 3000 years.
How would that be done in a lab to the satisfaction of anybody that would deny evolution to begin with.
There is no experiment that will satisfy people of this because they don't want to know.