Staples have a nice little interactive speed read tester on their website at the moment. It's a simple piece of text you have to read timed, followed by some questions to check you actually read it!
I came in at 600 words per minute, which is 140% above the national average apparently - although, it is an american website. According to the results I could read War and Peace in 15 hours and 34 minutes.
Check it your for yourself here;