I think this is a double question. How often do I check my email AT WORK? Constantly, because I work on the computer, and I know when something's come through. Plus, email is the way to communicate in this office.
At home, it varies. I may not check it as often. Like I said, anyone who has urgent info for me knows to call me. I guess my initial reaction in this thread (sorry for sounding snarky before, CC, but maybe this will help explain it a bit) comes from the people in my life (ie, internet friends that I have) that get really upset when I don't get an email from them as soon as they send it. Well, these particular people don't work. And, from what I can tell, they really don't do much of anything besides sit on the computer all day. So, they have time to email people and play. I can't do that. And, at the end of the day, I'm exhausted and not always willing to log BACK onto the computer at home having been on one all day. When I get home, I want to eat, play with my kitty and get to bed. Getting into email every day isn't one of my priorities. Yet, these people are offended that I can't do that. I try to get into my personal email at least once a week, but I can't always make that promise.
So, it depends on what kind of email you're referring to, CC.