How often do you email a supervisor? I'm doing a PhD related to my supervisor's research area. Sometimes, I think about problems that I do not immediately know the answer to. Naturally, I come to Stack Exchange and other forums and ask :) But on some occasions, the question is rather specific so I email my supervisor instead.

How often do you generally email a supervisor about research questions? I know he has other PhD students plus his own research to do. I have a weekly 45 min meeting with him, so I try to save questions for that and give a report to him about what I did in the previous week. On very rare occasions, he comes down to the lab and we talk in person. I usually email him when there is some administrative stuff we need to talk about, but I'm asking about research questions here or about giving updates about the progress of my research.
When you email him, at your current rate, how often do you get responses? Has he indicated that it bothers him? (either directly or by showing signs that it annoys him) If not, why are you worried about it?

I'll add that the right question to ask is probably not “how often can I email him?”, but rather “am I emailing him with the right questions?”. What will definitely annoy your advisor, and pretty much any other person, is if you ask them series of questions to which you could have found the answer yourself, or questions whom they are not the right person to ask.