This is actually being studied at the moment, and for the most part the results aren't what we in the bodybuilding community expect at all.
The actual dosing is even as frequent as x2 times PER DAY, they are finding. Which is crazy.
As it turns out, regardless of blood serum levels, some people's bodies are hyper efficient at making new aromatase after it is destroyed. And that is why Aromatase is often weaker, compared to Arimidex and its action of BLOCKING aromatase.
I personally HAVE to dose it ED. And won't even come close to crushing Estrogen, whereas on Arimidex I can easily drive it under 20. As always, everyone's different.