What is the normal waiting time for email replies from embassies regarding visa inquiries?

So I read in a few different places that if you have questions about applying because you have a specific situation that's not the norm, that you should contact the embassy where you plan to apply, so that you can be sure you have everything in order according to that embassy's requirements. Well, my plan is to go to Cambodia to apply. And so I emailed the embassy last week on Sunday. I was expecting they may read it on Monday and reply like on Monday or Tuesday. But it's already Sunday again ( a whole week passed) and still no answer from them. Anyone experience email communication with embassy's like this in which it's just a couple of questions needing answering so I can continue my application prep? What's normal as far as waiting on an email reply?