Chrome: Tracking your time keeps you productive and lets you identify time wasters. If you spend most of your time in Chrome, Chrome Visual History gives you a pie chart of your surfing history.
This extension doesn't block websites like StayFocusd does. Instead, It gives a history like Better History, and it puts it into a pie chart so you can see what sites you spend (or waste) the most time on. It breaks it down by day, week, month and all time based on your Chrome history. You'll quickly spot your time wasters and can adjust your behaviour accordingly.
Chrome Visual History [Chrome Web Store]