I feel you. I had this same concern at first. It took me a while to realize that my WC is working on a wedding almost every day and that she is busy and not in front of a computer often. If I had it my way she would be like me and have a black berry attached to her hip and be able to answer my questions throughout the day, however that is not the case. I have come to realize that if I send her everything I can come up with in one day, she ususaly can answer those questions by the next day. When I get that email, I respond with my next set of questions. I have found it most beneficial to put my questions in a number format like this:
1.
2.
3.
So that everything gets addressed. Most of the time it does, if it gets skipped, its easy to just add it to the list the next time.