Email. Love it or hate it, we all depend on it. And chances are, it takes up a large chunk of your day. In fact, experts say we spend anywhere from 14 percent to 28 percent (or more) of the average 40-hour workweek taming our inboxes. Email is important, but it shouldn't take over your life or dictate your schedule. Here are five hacks to help improve your email productivity and make sure you're working efficiently.